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In mathematical formulas, when I type letter w, it becomes very similar to the greek omega. What is the best way to print a "triangular" letter w unlike omega in the equation.

Thanks!

Dear all!

I cannot to understand why I have chapter title in bibliography reference page?
Code:

\documentclass[10pt]{book}
\usepackage{amsmath,amssymb}
\usepackage{mathtext}
\usepackage[T1,T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[russian, english]{babel}
\usepackage{graphicx ...

Dear Stefan! Thank you for your answer.
I have prepared one section without images and so on.

You can compile it by yourself and check header problem.

PS inside you can find some wrong links to the figures and equation because I have deleted many other sections and figures.

Dear all!
I have a problem with the setting of section title styles.
I have quite long titles and they often go beyond the width of the text. I also want to prevent word wraps in the title.
Now it seems like this
ex.png

Could you help me to limit title width and prevent word wraps?

My header is ...