LaTeX is a markup language and document preparation system. To create a LaTeX document (a .tex file), you need to use a text editor such as WinEdt or TeXworks. Most professional math papers are written in LaTeX.
Free download:
- AMS Author Resource Center: https://www.ams.org/publications/authors/authors
Some text editors designed for LaTeX:
- TeXworks, Freeware often used by students: https://www.tug.org/texworks/#Getting_TeXworks
- WinEdt, Inexpensive ware: https://www.winedt.com/index.html
- ScientificWord, Expensiveware: https://www.mackichan.com/
- TeXShop, free (for Macs): https://pages.uoregon.edu/koch/texshop/index.html
Other AMS resources for LaTeX:
- AMS LaTeX resources: https://www.ams.org/publications/authors/tex/amslatex
- AMS distributed user’s guide to AMS LaTeX: ftp://ftp.ams.org/ams/doc/amstex/amsguide.pdf
Several other user guides:
- https://mirror.hmc.edu/ctan/info/mil/mil.pdf
- https://http://legacy-www.math.harvard.edu/texman/
- https://www.cs.princeton.edu/courses/archive/spr10/cos433/Latex/latex-guide.pdf