mathastext

\usepackage[T1]{fontenc}
\usepackage[german]{babel}
\usepackage[variablett]{lmodern}
\renewcommand\familydefault\ttdefault
\usepackage[LGRgreek]{mathastext}
\MTgreekfont{lmtt}\Mathastext

Optimal typographical results for documents containing mathematical symbols can only be hoped for with math fonts specifically designed to match a given text typeface. Although the list of freely available math fonts for (PDF)LaTeX is slowly expanding (Computer Modern, AMS fonts, PX fonts, TX fonts, Fourier-GUTenberg, Math Design, Kepler Project, newtx, mathabx, others ... ; and ([2012/10/27]) on the Unicode side (XeTeX/LuaTeX): Asana-Math, XITS, Latin Modern Math, TeX Gyre Pagella Math, TeX Gyre Termes Math) it remains limited. Chances are you will not find a math font which fits well with your favorite text font. Try out mathastext: it will simply use the text font also for the math! (additionally to Latin letters, digits, punctuation signs, a few math symbols available in the ascii set, such as +,–,<,>,=, will also be picked up from the text font.) Often this gives quite satisfying results especially if, like the author, you aim at a very unified look for the document, and in particular prefer upright to slanted shapes for math (mathastext does have an option to maintain the usual slanted shape).

The package originates in some (even worse) macros I had been using many years ago to produce handouts as if done on a typewriter, or better said, to produce documents with a somewhat rough, but unified look, done by a real human and meaning to convey some message to real humans. The hope was to coerce the reader into making a real effort at assimilating the entirety of the material, text and math, not knowing in advance which piece would prove to be more important than the others. In a well-crafted mathematical document, every single part is as important as any other one, or, rather, it is up to the reader to uncover the web of links between atoms.

The example on the side uses a typewriter font which well illustrates the purpose. But mathastext will work with all kinds of fonts and can produce less militant math: see the examples (be patient, this page with its embedded png images weighs circa 5 Mo!) A notable feature of mathastext is to give a simple interface to using many distinct math fonts in the same document: special example.

Related packages by the author:
- lgrmath (use LGR-encoded fonts in math mode)
- libgreek (Greek letters in math mode from Libertinus or Linux Libertine/Biolinum)
  
  The original version of this package (2011/03/14) used the support files of the libertine LaTeX font package (which made Linux Libertine usable via pdfLaTeX). It got broken at the time of a 2018 release of libertine when the libertine-legacy got moved to the obsolete section of CTAN, and thus stopped being distributed by TeXLive (and presumably MikTeX).
  
  The current version, 1.1 of 2022/11/11, uses the LGR-encoded font files from the libertinus-type1 package by Bob Tennent which gives an interface for pdfLaTeX users to the Libertinus OpenType fonts. For perfect backwards compatibility, if executed on a LaTeX system where libertine-legacy is still installed, libgreek will use it. Else (or if mandated by the libertinus option) it uses the font definition files from libertinus-type1.
  
  In this context, note that libertinust1math by Michael Sharpe provides complete math support to pdfLaTeX to use the OpenType math part of Libertinus. But then the simplest is for the document text to also use Libertinus via libertinus-type1 and you presumably don't need mathastext!
- pxgreeks (select upright/italic shape for the Greek letters from the PX fonts)
- txgreeks (select upright/italic shape for the Greek letters from the TX fonts).
Random bits of info:
- The sans-serif member of the document font family gives often good results when used in math-mode, in parallel with the text in serif.
```
\renewcommand{\familydefault}{\sfdefault}
\usepackage{mathastext}
\renewcommand{\familydefault}{\rmdefault}
```
  It is then even less recommended to use the italic option (matter of taste!).
- How get in math mode the upright Greek letters from Computer Modern? Include in your preamble:
```
\usepackage{my_nice_font}
\renewcommand{\familydefault}{cmr} % or cmss or cmtt for sans resp. mono
\usepackage[LGRgreek, further options]{mathastext}
\renewcommand{\familydefault}{\rmdefault}
\Mathastext
\begin{document}
```
  The Greek letters will be from the LGR encoded CM font (and will be in upright shape, except if italic was among the mathastext options).
- The previous trick works for (pdf)LaTeX as well as for XeLaTeX or LuaLaTeX. For XeLaTeX the mathspec package is a (far) better choice, but if you wish you can still use mathastext for its other aspects (math versions...).
- The LGRgreek option (\usepackage[LGRgreek]{mathastext}) picks up the Greek letters in LGR encoding from the default font family at the time of loading mathastext. Starting with version 1.15c it is possible to have distinct Greek fonts in each math version. I mentioned already above that the CM/LM fonts are available (in Type 1 version for inclusion in pdf files) in LGR encoding for serif, sans-serif, and typewriter families (they actually belong to the "cbfonts".) Other available fonts in standard TeX distributions: the Greek Font Society fonts (such as GFS Didot), the epigrafica and kerkis packages, the txfontsb package which extends the txfonts package with LGR-encoded Greek letters, the droid, comfortaa, dejavu, and opensans package.
- Note that mathastext makes proviso only for monotonic Greek letters (in math mode; many of these packages are designed for polytonic Greek in text mode). After loading mathastext with option LGRgreek one should take note that \varphi and other `var' letters (except \varsigma) are not provided by this encoding, so the package does not make any specific assignments to such `var' macros.

(Shortened) Version history:

2011/01/25 1.0 Initial version. (doc)
2011/02/01 1.1 bugs fixed; options italic and frenchmath; minus as endash.
2011/02/06 1.11 bugs fixed; \Mathastext admits optional math version name.
2011/03/11 1.13 bugs fixed; option LGRgreek.
2011/04/03 1.14b bugs fixed; options LGRgreeks and selfGreeks.
2012/09/26 1.15 option subdued allowing the mathastextification to act locally.
2012/10/05 1.15c commands to set-up distinct LGR Greek fonts in each math version.
2012/10/22 1.15e improvements to subdued; automatic spaces after \forall and \exists.
2012/10/25 1.15g improvements in \#,\&,\$,\%; code cleaned up and better documented.
2012/12/20 1.2 extended scope of the math alphabets; automatic space before
the derivative glyph; documentation improved.
2013/12/31 1.2b automatic italic corrections in math mode.
2013/01/10 1.2e remaining technical issues with active characters in v1.2 and v1.2b
solved; extended test files, documentation, and source code comments
2013/09/02 1.3 new command \MTsetmathskips.
2013/12/14 1.3c mechanism of "inheritance" in the declaration of mathastext math versions.
starred variant of \MTversion leaves untouched the text font.
2014/05/23 1.3d new commands \MTstandardgreek and \MTcustomgreek.
2015/09/10 1.3e bugfix (option nosmalldelims badly redefined \lbrace and \rbrace).
2015/09/12 1.3f info rather than warning viz. amsmath's \resetMathstrut@.
self extracting README.md with Markdown syntax.
2015/10/15 1.3g compatibility patch with LaTeX 2015/10/01 regarding LuaLaTeX.
2015/10/31 1.3h bugfix regarding options symbolgreek/selfGreek/selfGreeks.
2016/01/06 1.3i compatibility layer with \url's use of math mode.
2016/01/15 1.3j stronger subdued mode and related under-the-hood changes.
2016/01/24 1.3k documentation fixes.
2016/01/29 1.3l compatibility with TL2016 fontspec.
2016/04/22 1.3n improved compatibility with amsmath.
2016/05/03 1.3o patches around LuaLaTeX+luaotfload font issues in math mode.
2016/10/31 1.3q option unicodeminus.
2018/08/22 1.3t compatibility fix with fontspec relative to subdued option.
no more redefinitions of \i and \j, only \imath and \jmath.
2019/08/20 1.3u support for math versions with varying font encodings.
2019/09/19 1.3v robust and protected math macros to match LaTeX 2019-10-01
2019/11/16 1.3w workaround to a (provisory) LaTeX+amsmath bug regarding
math accents
2022/11/04 1.3y options ncccomma, binarysemicolon and frenchmath*.
with LGRgreek: \...up and \...it variants for Greek letters
and \mathgreekup/\mathgreekit alphabets.
2023/09/01 1.3z fix 1.3y regression regarding selfGreek option.
2023/12/20 1.3za option LGRgreek+, documentation improvements.
2023/12/29 1.3zb frenchmath* update, decimalcomma, modified build logs, documentation.