How to make Greek letters in formulas in bold in LaTeX

As you know, in the formulas LaTeX Greek letters and integrals are oblique. In the old Soviet literature in the formulas, Greek letters and integrals were straightforward and some people demand that Greek letters in articles, dissertations, abstracts and other documents should also be in plain text.
The following is a package that can implement this in LaTeX. I made this package in the process of working on my dissertation, when they asked me to have Greek letters in formulas in plain text.

This is a picture that shows how formulas written in LaTeX will look like if you connect my package:


If someone suddenly needed this, then see under the cat.
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I did not find a complete package for LaTeX that implements such a function. The search for a solution led to the use of the mathptm package, but with this package the formulas begin to look like in Word. Latin characters become intermediate between normal and bold. Also bold is lost in the headers \ section, \ subsection.

In general, I had to make my own bike.
The idea behind my package is borrowed here . The link explains how to redefine the Greek letters in the preamble of the document.

Everything is designed in the form of three packages:

• rumathgrk - defines straight Greek characters
  for example, \ alphaup - the direct letter "alpha" \ betaup - the direct letter "beta", etc.
  
• rumathgrk1 - overrides standard Greek characters (\ alpha, \ beta, etc.) so that they are straight
• fixint - redefines integrals to be straight. It should be noted that the disser class with the fixint option does the same.

To use connect in the preamble of any of these packages in any combination. To use the fixint package, you need to connect the amsmath package. Packages are compatible with the popular set of disser dissertations.

Here is an example of a minimal document:

\documentclass[a4paper,12pt]{article} \usepackage[koi8-r]{inputenc} \usepackage[russian]{babel} \usepackage{hyperref} \usepackage{mathtext} \usepackage{amsmath} \usepackage{fixint} %     \usepackage{rumathgrk1} %        \begin{document} %         \begin{equation} S(\omega)=F[s(t)]=\int\limits_{-\infty}^{+\infty}s(t)\mbox{e} ^{-j\omega t} dt \end{equation} \begin{equation} F=\frac{q_1 q_2}{4\pi \varepsilon_0 \varepsilon r^2} \end{equation} \end{document} 

If direct integrals and Greek letters in the document are no longer needed, then you just need to remove the rumathgrk1 and fixint packages from the preamble.

You can pick up ready-made packages from Githba: from here On Linux, if git is installed, you can do this with the command:

 git clone https://github.com/ra3xdh/rumathgrk 

To install in Linux and TeXlive in the console, go to the directory with the package and execute the command:

 make install 

In Windows, packages have not been tested, but should also work. You need to install them manually for MiKTeX. May be used for any purpose.

Finally, I note that I prefer the standard oblique Greek letters and integrals from LaTeX. I would also like to note that, in general, our people relate to oblique integrals and tolerate Greek letters. Usually, the standard LaTeX font suits everyone.