All document in single font (I need math operator in Times New Roman)

Question

The task arose to create a template in which the text and mathematical formulas are written in the Times New Roman font, since it is the standard in Russian universities. It turned out almost everything, except for some characters, please tell me how it can be corrected? Perhaps you already have a template where everything is written in a single font?

My code

\documentclass[14pt]{extarticle}

\usepackage{graphicx}
\usepackage{amsmath,amsfonts,amssymb,amsthm}
\usepackage {tabularx}
\usepackage {longtable}
\usepackage {multirow}
\usepackage {multicol}
\usepackage{booktabs}


\usepackage{setspace}
\onehalfspacing
\usepackage{indentfirst}
\setlength{\parindent}{1.25cm}
\usepackage{euscript}


\usepackage{icomma}

\usepackage{mathspec}
\newcommand*{\myfont}{Times New Roman}
\setallmainfonts[Ligatures=TeX,Scale=0.975]{Times New Roman}
\setmathfont(Digits,Greek,Latin){\myfont}
\setmathfont(Greek)[Lowercase=Regular]{\myfont}
\usepackage[english,russian]{babel}

\usepackage{titlesec}
\titleformat{\section}[hang]{\normalfont\bfseries}{}{0pt}{}
\titlespacing{\section}{\parindent}{6pt}{6pt}
\titleformat{\subsection}[hang]{\normalfont\bfseries}{}{0pt}{}
\titlespacing{\subsection}{\parindent}{6pt}{6pt}

\usepackage{geometry} 
\geometry{a4paper, top = 2cm, bottom = 2cm, left = 3cm, right = 2cm}

\usepackage[unicode]{hyperref}
\hypersetup{
    colorlinks=true,
    urlcolor=black,
    filecolor=black,
    linkcolor=black,
    filecolor=black,
    citecolor=black
}

\RequirePackage{caption}
\DeclareCaptionLabelSeparator{defffis}{ --- }
\captionsetup[figure]{justification=centerlast,labelsep=defffis,textfont=onehalfspacing}
\captionsetup[table]{justification=raggedleft,labelsep=defffis,textfont=onehalfspacing,singlelinecheck=off}
\captionsetup{belowskip=-6pt}


\usepackage{ragged2e}
\usepackage{microtype}
\justifying
\sloppy
\tolerance=500
\hyphenpenalty=10000
\emergencystretch=3em

Answer 1

You want something like

\usepackage{unicode-math}
\usepackage{amsthm}

\setmainfont{Times New Roman}
\setmathfont{TeX Gyre Termes Math}[Scale=MatchLowercase]

Be careful: some Linux boxen ship with a version of Times New Roman from last century. You can load TeX Gyre Termes instead if this causes a problem.

You still want to load most of the same packages, but not amsfonts, amssymb or euscript, all of which are superceded by unicode-math. They shouldn’t do any harm, but they won’t work. If you need something close to Euler Script as \mathscr, you can add the line

\setmathfont{Latin Modern Math}[range={scr,bfscr},
                                Scale=MatchUppercase]

(There is also an OpenType version of AMS Euler, including script and fraktur, if you want it.)

If you do not want to use unicode-math, alternatives include:

\usepackage{newtxmath}
\usepackage{fontspec}

\setmainfont{Times New Roman}
\usepackage{mathastext}

There might be a few incompatibilities with some Greek letters.

Or, in XeLaTeX:

\usepackage{newtxmath}
\usepackage{mathspec}

\setmainfont{Times New Roman}
\setmathsfont(Digits,Latin,Greek){Times New Roman}

Answer 2

[Solution path]

First, I had to accept the fact that Times New Roman is not a mathematical font by default. Times New Roman simply does not contain some symbols, such as the reduced Planck constant or the partial differential. I decided to use Latin Modern Math.

Secondly, the structure of the code has been changed, and I am applying it here because I believe that I am not the only person who was looking for ways to solve the problem.

%!TEX encoding = UTF-8 Unicode
\documentclass[14pt]{extarticle}


\usepackage{datetime}
\usepackage{texdate}


\usepackage{graphicx}
\usepackage{amsmath,amsfonts,amssymb,amsthm}
\usepackage {tabularx}
\usepackage {longtable}
\usepackage {multirow}
\usepackage {multicol}
\usepackage{booktabs}

\usepackage{setspace}
\onehalfspacing
\usepackage{indentfirst}
\setlength{\parindent}{1.25cm}
%\usepackage{minted}
\usepackage{euscript}


\usepackage{fontspec}
\setmainfont{Times New Roman}                 
\usepackage{unicode-math} 
\setmathfont{Latin Modern Math}
\usepackage{icomma}


\usepackage[english,russian]{babel} 

\usepackage{titlesec}
\titleformat{\section}[hang]{\normalfont\bfseries}{}{0pt}{}
\titlespacing{\section}{\parindent}{6pt}{6pt}
\titleformat{\subsection}[hang]{\normalfont\bfseries}{}{0pt}{}
\titlespacing{\subsection}{\parindent}{6pt}{6pt}

\usepackage{geometry} 
\geometry{a4paper, top = 2cm, bottom = 2cm, left = 3cm, right = 2cm}

\usepackage[unicode,psdextra]{hyperref}[2012/08/13]
\hypersetup{
    colorlinks=true,
    urlcolor=black,
    filecolor=black,
    linkcolor=black,
    filecolor=black,
    citecolor=black
}

\RequirePackage{caption}
\DeclareCaptionLabelSeparator{defffis}{ --- }
\captionsetup[figure]{justification=centerlast,labelsep=defffis,textfont=onehalfspacing}
\captionsetup[table]{justification=raggedleft,labelsep=defffis,textfont=onehalfspacing,singlelinecheck=off}
\captionsetup{belowskip=-6pt}

\usepackage{ragged2e}
\usepackage{microtype}
\justifying
\sloppy
\tolerance=500
\hyphenpenalty=10000
\emergencystretch=3em