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# Teach Sector

## Sitemaps

- [XML Sitemap](https://teachsector.com/sitemap.xml): Contains all public & indexable URLs for this website.

## Posts

- [Blog](https://teachsector.com/blog/)
- [Python vs Rust: Choosing Your Language](https://teachsector.com/python-vs-rust-choosing-your-language/) - Python is one of the most ubiquitous and popular programming languages nowadays. It can power anything from simple scripts and web applications to data analytics. On the other hand, Rust is an up-and-coming programming language quickly gaining popularity in the tech community. Both these programming languages offer their own distinct advantages and disadvantages. In this
- [The Best Python Alternative You Can Find - Course and Certifications](https://teachsector.com/the-best-python-alternative-you-can-find-course-and-certifications/) - If you're looking for a great python alternative that is powerful, yet easy to learn, you should consider D programming language. D is a great Python alternative and can be used for a wide variety of applications. The D programming language is easy to read and write and has a wide range of features that
- [D Programming Language Striving to Become the Best Programming Language for GUI](https://teachsector.com/d-programming-language-striving-to-become-the-best-programming-language-for-gui/) - D is one of the best general-purpose programming languages, as I describe in a text at the D programming language course page. (Actually, I claim that D shares with Rust the title of the best programming language.) How good is D specifically for GUI programming? In GUI programming everything is the used GUI library. So
- [Object Oriented Programming in Java](https://teachsector.com/object-oriented-programming-in-java/) - This article will help give you a thorough understanding of the underlying principles of object-oriented programming and its concepts. Once you understand these concepts, you should have the confidence and ability to develop basic problem-solving applications using object-oriented programming principles in Java. What is Object Oriented Programming? Object-oriented programming (OOP) is a fundamental programming paradigm
- [Copying a machine using rsync](https://teachsector.com/copying-a-machine-using-rsync/) - I am trying to copy a machine to another hosting (however, both on AWS). I have an AWS Lightsail x86 machine with Bitnami WordPress Multisite and have created a new Debian 11 (the same version of Debian as my Bitnami) on EC2. Then after installing and configuring rsync and configuring SSH public/private keys I run
- [The Best Programming Language for Kids? Take two?](https://teachsector.com/the-best-programming-language-for-kids-take-two/) - I present my pedagogical concept: Kids need to learn two programming languages: one easy and one "correct". Why two languages? Once I wrote in a Web forum: Why Russian schools still teach Pascal, not something more modern such as Python? Another person pulled me up: "Python?! You want children to study crap-code?" I realized that
- [How D language is better than Java](https://teachsector.com/how-d-language-is-better-than-java/) - The D language is one of the most powerful programming languages out there today. It's an incredibly versatile language that is extremely efficient, giving it a clear advantage over Java. With its low-level features and advanced memory management capabilities, it provides developers with an unparalleled level of control over their code. In this article, we'll
- [D Language As a Better Alternative To C++](https://teachsector.com/d-language-as-a-better-alternative-to-c/) - D language is a newer programming language than C++ and it has some advantages over the latter. Some of the benefits of using D language include: Easier to read and debug code: D has a more modern syntax than C++ which makes it easier to read and debug. This is especially useful for beginners as
- [What Comes First Design Or Code? A Guide for Software Engineers](https://teachsector.com/what-comes-first-design-or-code-a-guide-for-software-engineers/) - Discover the answer to the age-old question of whether design or code should come first. Learn from expert software engineers in this 2023 guide.
- [Earn High Commissions with 'D' Programming & 'Discontinuous Analysis' on ClickBank!](https://teachsector.com/earn-high-commissions-with-d-programming-discontinuous-analysis-on-clickbank/) - Attention all affiliate marketers! Are you looking for high-quality, in-demand products (STEM courses) to promote to your tech-savvy audience? Look no further than our two cutting-edge courses: "D, the best programming language for former Python developers" and "Discontinuous Analysis." Our "D" course is perfect for developers looking to stay ahead of the curve in the
- [Discontinuous Analysis for Economics PhD's](https://teachsector.com/discontinuous-analysis-for-economics-phds/) - Discontinuous analysis is a useful tool for economists who are interested in studying sudden changes or discontinuities in economic behavior.
- [Discontinuous Analysis for math PhD's](https://teachsector.com/discontinuous-analysis-for-math-phds/) - PhD students in mathematics who are interested in discontinuous analysis may also benefit from conducting independent research in this area.
- [Discontinuous Analysis for physicist](https://teachsector.com/discontinuous-analysis-for-physicist/) - Discontinuous Analysis can provide physicists with valuable insights into the behavior of physical systems, and can be a useful tool for solving problems.
- [Should Python Programmers Switch to D?](https://teachsector.com/should-python-programmers-switch-to-d/) - Discover the best book to learn Python, explore dynamic programming in Python, and delve into D as a potential language switch. Get insights into Python programming PDFs and more.
- [A Comprehensive Guide for Python Programmers](https://teachsector.com/a-comprehensive-guide-for-python-programmers/) - Master Python's dynamic programming for efficient problem-solving. Level up with advanced techniques & syntax mastery in Python programming
- [Mathematical Philosophy: Absolute and Relative Evil](https://teachsector.com/mathematical-philosophy-absolute-and-relative-evil/) - "Mathematical Philosophy: Absolute and Relative Evil" is available for purchase and download on several platforms, including Amazon and Barnes & Noble.
- [Learn D Programming Language: A Comprehensive Guide](https://teachsector.com/learn-d-programming-language-a-comprehensive-guide/) - Victor Porton offers a D Programming Language Course, suitable for beginners with basic Python knowledge. Visit now our website for get courses.
- [Two underestimated IT projects](https://teachsector.com/two-underestimated-it-projects/) - There are at least two very much underestimated projects in the field of information technology. The first one is of course Linux for desktop computers. The second underestimated project is Ada programming language. It could well compete with C++ but is better (more reliable, compiles faster, has less cumbersome features, has integrated support for parallel
- [Buggy driver of Lexmark X2670?](https://teachsector.com/buggy-driver-of-lexmark-x2670/) - I bought a Lexmark X2670 printer/scanner device today. I downloaded their Debian Linux driver from Internet. When trying to install, it was firing an error message that CUPS 1.2 or above is necessary despite I have CUPS 1.4.1. After some magic with the source it was installed. (Don't ask me, search it in Internet, because
- [Wordpress "Share this" displayed wrongly](https://teachsector.com/wordpress-share-this-wrong/) - "Share this" is displayed wrongly by WordPress. Here is an example of "Facebook, Twitter, Email" share this in the theme Kubrick: If I add more widgets, it turns even worse.
- [TeXmacs fork - option groups](https://teachsector.com/texmacs-fork/) - I added option groups to GNU TeXmacs. This is primarily (well, currently exclusively) used to save options for conversion to LaTeX. For example one can have an option set for inserting LaTeX snippets to a blog and an option set for creating articles for math journals. My patch was not accepted by the main TeXmacs
- [MetaTags2 sidebar for Firefox released](https://teachsector.com/metatags2-sidebar/) - I release an ALPHA version of MetaTags sidebar for Firefox. It displays page info, keywords, description, etc. in browser sidebar.
- [I'm going to write XML namespaces transformations standard](https://teachsector.com/work-on-xml/) - My mathematical research has stuck. Thus I decided for now to change my research field. Now I am going to work about XML. I am going to write a standard (in the hope that it will become a W3C recommendation) about automatic transforming between different XML namespaces. Now I am writing a draft, which is
- [Automatic transformation between XML documents with different namespaces - first draft](https://teachsector.com/automatic-namespaces/) - I've put online the first version of Automatic transformation between XML documents with different namespaces draft. This draft is probably yet unreadable, you may comment on whether you understand it. This is a very preliminary rough draft. There may be errors, omissions, and logical inconsistency. There are many things to add for this draft to
- [My XML project has failed](https://teachsector.com/my-xml-project-failed/) - My writing of a specification how to do transformation between XML namespaces automatically (by putting transformation info in RDF format at namespace URLs) has failed. Here is the draft of the specification. (in Word 97 format). A quote from the specification draft: This specification writing project has failed. I have set contradictory design goals: 1.
- [Replacement of paper in HP printers](https://teachsector.com/paper-in-hp-printers/) - I've bought an HP printer, but laid it into an attic because it persisted to highlight "no paper" indicator even after I inserted paper. So I bought an other (also HP) printer: DeskJet 1050A. Soon I've found a similar trouble with it. It was not ceasing highlight "no paper" indicator even after insertion of paper.
- [Running an XWindow program from a terminal](https://teachsector.com/xwindow-program-from-terminal/) - Suppose you want to to start an XWindow program from a terminal with its input, output, and error output redirected to null (/dev/null). Moreover you want the started program not to be hit with SIGHUP signal and exited when you close the terminal window from which you've started it: x glxgears It can be done
- [My experience with Gnome 3 in Debian Linux](https://teachsector.com/gnome/) - Because the latest Skype for Linux was not installable with Debian Linux 6 (Squeeze) I decided to install pre-release ("testing") of Debian Linux (called "Wheezy" or just Debian 7). The main change which I felt was Gnome 2 -> Gnome 3. Previously I used Sawfish window manager. I liked it for configurability. I especially liked
- [Running X sessions and setting the environment](https://teachsector.com/running-x-sessions/) - Since the long ago time when I used both XWindows and Linux console using getty program, I've setup some files this way: ~/.bash_profile #!/bin/bash source ~/.bashrc source ~/.bash_common ~/.xsession #!/bin/bash source ~/.bash_common numlockx on exec gnome-session In ~/.bash_common I've put export Bash statements to set environment variables I use both in console sessions and in
- [prettyPhoto AJAX patch](https://teachsector.com/prettyphoto-ajax-patch/) - prettyPhoto patched to load photos through AJAX when reaching start or end of the list of photos on the current page. http://demo.freesoft.portonvictor.org/prettyPhoto-AJAX.html Currently this patch is buggy: See http://demo.freesoft.portonvictor.org/prettyPhoto-AJAX.html for details of its current status.
- [Yii: Combining two DB tables into one model](https://teachsector.com/yii-two-tables-in-model/) - Let we have two related SQL tables: CREATE TABLE `user` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `login` varchar(255) COLLATE utf8_bin NOT NULL, `email` varchar(255) COLLATE utf8_bin NOT NULL, `password` varchar(255) COLLATE utf8_bin NOT NULL, `firstname` varchar(255) COLLATE utf8_bin NOT NULL, `lastname` varchar(255) COLLATE utf8_bin NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
- [Transforming an array into multilevel array (PHP)](https://teachsector.com/php-multilevel-array/) - In PHP there is function array_combine(). This function may not work as expected in the case if a key is met more than once. For this reason, I created the following function: function array_combine_array($keyname, $array) { $ret = array(); foreach($array as $value) { $key = $value[$keyname]; if(!isset($ret[$key])) $ret[$key] = array(); array_push($ret[$key], $value); } return $ret;
- [Yii extension composite-model](https://teachsector.com/yii-composite-model/) - I've created a simple extension for Yii framework. My extension allows to combine several models (instances of CModel class) into one model. The current release is alpha quality. But reports are appreciated.
- [I continued to write my XML standard](https://teachsector.com/namespaces-continue/) - I wrote earlier that my specification writing project failed, because I set contradictory goals to sort transformation both by precedence and by stability and completeness, what is impossible. Now I found a way to continue this project. Basically I just sort first by precedence and only after this by stability and completeness. It is a
- [My XML standard again fails](https://teachsector.com/xml-standard-again-fails/) - I wrote earlier that my XML standard writing (about automatic transformation between XML namespaces) failed. I have later resolved that problem, see standard draft (in Word 97 format), but now I found another problem: For my idea to work in practice, one needs to be able to deal with Turing complete plugins which are however
- [Toward robust Linux sandbox](https://teachsector.com/toward-robust-linux-sandbox/) - Sandboxing means running a program in a closed environment (such as no permission to open new files, no or restricted network access, etc.) in order to protect from malicious or erroneous software. In Fedora Linux there is `policycoreutils` package which contains bin/sandbox based on SELinux. This sandbox is not perfect however. So in this post
- [CIL compiler for Debian released](https://teachsector.com/secilc-for-debian-released/) - As a step toward toward robust Linux sandbox, I have released CIL compiler for Debian Linux. See version 0.0.0+git20140511-1 (not 0.0.1-1) at this link for the source. It compiles on x86 architecture. It is unknown whether it works on x86_64 and other architectures. Patches are welcome.
- [XML namespaces - my development plan](https://teachsector.com/xml-namespaces-first-plan/) - Despite of that I have earlier said that my specification writing fails, I have developed a more or less consistent specification which I am going to implement. I am going to implement it in the form of a HTTP proxy server, in Ada programming language. One reason for this is that Ada is a good
- [A new version of XML Namespaces Transformations specification](https://teachsector.com/a-new-version-of-xml-namespaces-transformations-specification/) - I've updated Automatic transformation between XML documents with different namespaces specification. The main difference of the last updated draft is that it supports running transformations on elements with namespaced attributes: It can be used for example to process XLink attributes, as in this example: a link Note that the detailed example is not
- ["The Machine" and Ada](https://teachsector.com/the-machine-and-ada/) - Hewlett Packard company announced a new kind of future computers, called The Machine. One of the features of The Machine is that it will have many special purpose CPU cores instead of a few general purpose cores like modern computers. This provides a challenge for software developers, to make efficient software for such an architecture.
- [Automatic XML transformations between namespaces - draft status](https://teachsector.com/xml-transformations-first-draft/) - I have revised the draft about Automatic XML transformations between namespaces. This is the first version of the draft which is nearly complete (except of descriptions of particular transformations). However: There may be errors, omissions, and logical inconsistency. There should be added more formal explanations (not just examples as now), more examples, and more explanation.
- [Updates to XML transformations specification (now with Turtle)](https://teachsector.com/now-with-turtle/) - I have rewritten my draft specification "Automatic transformation between XML documents with different namespaces". Now it uses Turtle (instead of RDF/XML) syntax in examples. As for now, the algorithm is nearly complete (but may require error checking and also formally explaining what I now just show with examples).
- [Recursive retrieval algorithm for XML transformations changed](https://teachsector.com/recursive-algorithm-changed/) - About my specification on automatic transformation between XML namespaces: I have rewritten the algorithm of recursive retrieval namespace and XML transformations descriptions. The updated algorithm allows to do such things as to not to download the destination namespace at all if all transformations can be done without its downloading. The algorithms (both the current and
- [New flexible recursive retrieval of XML namespaces information](https://teachsector.com/flexible-recursive/) - As an update to the previous version of the specification I have written a new draft of Automatic transformation between XML documents with different namespaces. This updated version supports the choice of the user to download only information referenced from the source or only information referenced from the destination. For example, it allows, when directly
- [A new data description language](https://teachsector.com/nlang/) - There is RDF. Why to create a new data description language? Several RDF files (possibly downloaded from the Web and non-trusted) may be merged in such a way that it creates contradictory data. It contradicts to design goals of this my project. We need to create a language which describes objects and objects are in
- [Specification draft moves to Wikiversity wiki](https://teachsector.com/specification-draft-moves-to-wikiversity-wiki/) - I've moved my work on "Automatic transformation of XML namespaces" to Wikiversity wiki site (as a research project). Now anyone can contribute. See this link: https://en.wikiversity.org/wiki/Automatic_transformation_of_XML_namespaces
- [Preserve old /etc/mysql/debian.cnf when copying /etc to an other computer](https://teachsector.com/mysqldebian-cnf/) - I've copied my /var/www, MySQL database, and /etc from a sever to an other server. After this I found that my MySQL does not work anymore. The reason for the trouble was that /etc/mysql/debian.cnf contains (twice) an auto-generated password for the database, and so after copying my old /etc directory from my old server the
- [NLang is deadborn](https://teachsector.com/nlang-is-deadborn/) - My proposal for a new data description language NLang alternative to RDF is probably deadborn. I have missed the rationale: The rationale for NLang was that the data is not messed up when loading information from several files. But today I've realized that I can just write RDF software in such a way that information
- ["The Machine" and operating system](https://teachsector.com/the-machine-os/) - I've said earlier, that Linux would be inefficient with The Machine computer architecture, because its different memory model. Thus, as I said earlier, The Machine requires development of a radically new operating system, not just an adaptation of Linux. I have said: Linux is dead. Recently I have realized that this is wrong: We indeed
- [VPS for an unbelievably low price](https://teachsector.com/vps-unbelievably-low-price/) - Today I have moved all my Web sites from an old VPS hosting to Digital Ocean VPS hosting. Their prices start from unbelievable $5 per month for a server with 20GB SSD disk. I myself use the 2GB RAM, 40GB SSD hosting for unbelievable price $20/month (not counting backup price). Click this link to order
- [My writer's block is overcome](https://teachsector.com/grouping-xml-elements/) - My writer's block for my XML-related standard went away. I propose to classify XML namespaces into three distinct groups regarding "interaction" of elements (or attributes) of the same namespace. Then we can transform between namespaces of the same precedences in such a way that in the case if elements interact, there remains only one namespace,
- [The driver by Innova is broken](https://teachsector.com/the-driver-by-innova-is-broken/) - I recently bought an UPS by the Innova company. On the box it was written "Linux". I opened the box and got a CD disk. On the CD was the folder "linux". In the folder was some old broken version of the program Upsilon and no driver. (The built-in driver coming with Debian Linux also
- [A new writer block on my XML transformations project](https://teachsector.com/writer-block-on-xml/) - I have several times said that this my project failed but it was salvaged again. Now I again have a "writer block" concerning this project. See this unsolved problem.
- ["Automatic transformation of XML namespaces" specification](https://teachsector.com/xml-namespaces/) - Automatic transformation of XML namespaces specification releases its first draft. From the specification: This is a preliminary rough draft. There may be errors, omissions, and logical inconsistency. There should be added more formal explanations (not just examples as now), more examples, and more explanation. The standard may change. However, the first draft is released and
- [Split HTML into separate chapters and ToC](https://teachsector.com/split-html-into-separate-chapters-and-toc/) - Yesterday I have written a simple program which splits an XHTML file into several chapters (separate HTML files) and ToC. The program is fully customizable and themeable. Get it at GitHub.com.
- [Why Linux is better than Windows](https://teachsector.com/linux-good/) - One man asked me: I have heard of Ubuntu Linux, but have never seriously considered using it. What makes it "good"? Here is my reply (not aspiring for completeness, Linux has other advantages also): I could say that the "main" advantage over Windows is that the system goes together with applications. You can update ALL
- [Finished translation of namespace transformer to Python](https://teachsector.com/finished-python-translation/) - I originally started to write my XML Boiler software in Ada. Ada compiler has too many bugs. I switched to Java. I discovered for myself that Java byte arrays are limited to about 4GB of bytes, this makes problematic processing of big XML files. I switched to Python. Now I have finished translating it from
- [Google AdWords bug slowed down my ad campaign :-(](https://teachsector.com/adwords-bug/) - I have started a Google Grant AdWords campaign for an USA based nonprofit recently (about two days ago). It worked well and I was enjoyed. But then it was closed for "maintenance" as they say for 2-3 days (I don't remember the exact word Google used to describe "maintenance".) After about a day maintenance seemingly
- [Expired access token in Google OAuth](https://teachsector.com/expired-access-token/) - I sought in Internet how to determine from Google response whether an access token is expired. I found no definitive answer. So, finally I created an access token and waited for a hour to see the Google response when I try to use this token. The Google response (with a partial list of HTTP headers)
- [A new problem appeared writing automatic XML transformations](https://teachsector.com/new-problem/) - This is about Automatic transformation of XML namespaces. Previously I divided all transformations into two groups: with a given source and target namespace (as converting DocBook into HTML); with only source given but not the target (as for XInclude). Today I've realized that it is a wrong division. Instead we need to split into: transformations
- [Library to spawn a process with given input and receive its output](https://teachsector.com/library-to-spawn-process/) - I have created a C library to span a process with given input and receive its output. One cannot just write to stdin of a process and then read its stdout through pipes, because this way it may lead to a deadlock. Instead use my library: Homepage API docs It is an alpha release, tested on
- [Letter to Martin Fowler](https://teachsector.com/204-2/) - Dear Martin, This is a letter to Martin Fowler, which I also publish in my blog. I am rather wondered why you don't do any mention in your article https://www.martinfowler.com/articles/injection.html about the following problem: Real classes which use dependency injection very often may need to pass some of their dependencies to implementation classes which they
- [XML Boiler project reached an important milestone](https://teachsector.com/xml-boiler-remains-debug/) - XML Boiler project reached an important milestone: To make the first release it remains to debug it. (Also need to create particular XML processing scripts to make it useful.) XML Boiler is the implementation of my Automatic transformation of XML namespaces specification, which is going to revolutionarize processing of XML documents both locally and on the
- [The anti-rating of people causing the most technological damage](https://teachsector.com/the-anti-rating-of-people-causing-the-most-technological-damage/) - This is the rating of the worst engineer decisions causing the most damage to the civilization. The 1 st place. Brian W. Kernighan and Dennis M. Ritchie. Estimated amount of damage: $50 trillion. What they did: They invented C programming language. The damage: Due to a sticky tradition most operating systems are written in this
- [The Worst Software Startup Ever](https://teachsector.com/the-worst-software-startup-ever/) - A man once contacted me and offered to participate in a joint software project. At first, I misunderstood him and thought it is just some open source. I refused because have more important projects to work on. But we kept talking, I realized that the proposed project is commercial. The project didn't look very promising,
- [A Programming Task I Overengineered](https://teachsector.com/a-programming-task-i-overengineered/) - There is a C library librdf. I wrote its D wrapper to be used for my revolutionary software XML Boiler. I did for most kinds of objects *WithFinalize and *WithoutFinalize. *WithoutFinalize holds a copy of a C library handle, which should not be finalized when the D struct holding it is destroyed. I wrote even
- [A New Independent Take on HTML Standards and How to Use My XML Templates in Practice](https://teachsector.com/a-new-independent-take-on-html-standards-and-how-to-use-my-xml-templates-in-practice/) - Almost since childhood I had two dreams: to discover algebraic general topology and to make my own XML standard on automatic conversion between XML namespaces. This article is related to the second topic. More specifically, this article is about applying my automatic XML transformations to the following problem: Create my own HTML-standard which is truly
- [The transcript of the correspondence with another developer](https://teachsector.com/the-transcript-of-the-correspondence-with-another-developer/) - Iury de Oliveira was my business partner, see The Worst Software Startup Ever. But he has go somehow mad (probably of bad alcohol). Now he is threatening me by emails that he will distribute a wrong information about me (that I distribute his software, however, there is no his single line of code in this
- [XML Boiler (Automatic transformation of XML namespaces) is released](https://teachsector.com/xml-boiler-first-release/) - I am happy to announce the first release (v0.1.0) of XML Boiler (Automatic transformation of XML namespaces) software. This release is alpha. But it seems to be already useful. For example, the documentation of XML Boiler is built using XML Boiler itself. Here is the list of advantages of this new kind of XML software: freely
- [Pure Dependency Injection in D](https://teachsector.com/pure-dependency-injection-in-d/) - Dependency injection A little modified quote from Wikipedia, Dependency injection article (This quote is licensed under CC BY-SA 3.0): In software engineering, dependency injection is a technique whereby one object (or static method) supplies the dependencies of another object. A dependency is an object that can be used (a service). An injection is the passing
- [Script to run a shell command without breaching security of your home dir](https://teachsector.com/script-to-run-a-shell-command-without-breaching-security-of-anything-except-your-home-dir/) - Script to run a shell command without breaching security of anything except of your home dir
- [3 Reasons for Choosing D Programming Language](https://teachsector.com/3-reasons-for-choosing-d-programming-language/) - See also the course D, the Best Programming Language, for Former Python Developers. The D programming language is a general-purpose statically typed programming language featuring a C-like style language structure and built as primary code. It is an excellent choice for developers for several reasons; below are some examples. Strong Modelling Performance Not infrequently, you might find
- [How to configure PostgreSQL in such a way that it uses indexes](https://teachsector.com/how-to-configure-postgresql-in-such-a-way-that-it-uses-indexes/) - Unlike MySQL PostgreSQL often skips indexes and does (unwanted) full table scan. I spent much time tuning PostgreSQL to make it use indexes. The following works for me: enable_bitmapscan = off #enable_hashagg = on enable_hashjoin = off enable_indexscan = on enable_indexonlyscan = on enable_material = off enable_mergejoin = on enable_nestloop = off #enable_parallel_append = on

## Pages

- [A Good Tech School, Homepage](https://teachsector.com/) - Welcome to Teach Sector! A learning content from Victor Porton's Foundation. We offer 3 online courses by experts. Get free lifetime access. Click to learn more!
- [Contact Us](https://teachsector.com/contact-us/) - Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form. Email Message Comment Name *FirstLastEmail *Comment or MessageSubmit
- [Discontinuous Analysis](https://teachsector.com/discontinuous-analysis/) - At Teach Sector, we provide a Discontinuous Analysis course. You will learn advanced calculus tricks to formalize the Divergent Series, such things as a derivative of a discontinuous function. Call now!
- [D Programming Language - Best Backend Programming Language](https://teachsector.com/dforpython/) - At Teach Sector, we offer a D Programming Language course, the best programming language for Python Developers. Visit our website today to learn more!
- [About Author](https://teachsector.com/about-author/) - Instuctor(s) Victor PortonVictor Lvovich Porton is a self-taught mathematician, researcher, author of multiple published books, and CEO of Zon Social Network, with a fervent passion for revolutionizing the field. Despite embarking on a 4.5-year mathematics program, his studies were unfortunately cut short due to discrimination. However, this setback did not deter his pursuit of knowledge.
- [Courses](https://teachsector.com/courses-2/) - Axiomatic Theory of Formulas$7.99 Discontinuous Analysis$19.97 General Topology as Ordered Semigroup Actions$7.99 Mathematical Philosophy: Absolute and Relative Evil$19.90 Programming Language D$55.00
- [Algebraic Theory of General Topology](https://teachsector.com/algebraic-theory-of-general-topology/) - Uncover the algebraic theory of general topology with Teach Sector's concise guide. Explore the fusion of algebra and topology today! Visit now our website!
- [Infinite Formulas](https://teachsector.com/infinite-formulas/) - Discover the power of infinite formulas. Explore comprehensive guides, examples, and applications to expand your mathematical horizons at Teach Sector.
- [Absolute and relative evil](https://teachsector.com/absolute-and-relative-evil/) - At Teach Sector, we offer a Mathematical Philosophy course. In this course you are taught a mathematical model of evil based on college mathematics and beyond.
- [Opt-out preferences](https://teachsector.com/opt-out-preferences/)
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- [D Programming Language - Best Backend Programming Language](https://teachsector.com/d-programming-language-best-backend-programming-language/) - D Programming Language The Best Programming Language, for Former Python Developers Master D programming language or DLang for Python programmers. “There is no best programming language”, they say. There is, for most applications D is the best among imperative languages. Switch your mind from nervous mode of finding bugs in your Python software (Have you
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