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4

The newtxmath package includes several options for changing the math font, e.g., to use the STIX2 fonts, libertine fonts, garamondx fonts, etc. without giving up the many other nice features of the newtx bundle. There is also an option varvw (and varg) that will load versions of v and w (and also y and g) that are more distinctive, so as to avoid confusion ...

7

First find the font. Then, if it is Unicode (U+1D708 is mathematical small nu, i.e. italic), use unicode-math to activate it with setmathfont{}. \documentclass[12pt]{article} %\usepackage{amsfonts} \usepackage{unicode-math} \setmathfont{STIX Math} \begin{document} \Huge $\nu$ \end{document} STIX Math is a partial match (for the pointy bit), Latin Modern ...

3

You're using ϑ (U+0391 GREEK SYMBOL THETA) instead of θ (U+03B8 GREEK SMALL LETTER THETA). Add an equivalence for the symbol (or use the letter). Using U+0391 won't get you the “open theta”; the glyph depends on the font. \documentclass{article} \usepackage[T1,T2A]{fontenc} \usepackage[utf8]{inputenc} \usepackage[polutonikogreek,latin,english,german,french,...

3

The answer by Sebastiano uses the teletype font (lmtt) for the theta. There are some alternatives with other font styles. Use the basic option for mathastext, which causes the package to only influence digits and Latin letters, resulting in the default math theta (but it limits the functionality of mathastext): \documentclass{elsarticle} \usepackage{...

6

Here, I think there is a solution using \MTgreekfont{lmtt}\Mathastext: this code is taken here http://jf.burnol.free.fr/showcase.html (there are many solutions) and I have put also the italic option. \documentclass{elsarticle} \usepackage[LGRgreek,italic]{mathastext} \MTgreekfont{lmtt}\Mathastext \begin{document} $0^{\circ}\leq \theta \leq 180^{\circ}$ \...

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