onlyams­math – In­hibit use of non-ams­math math­e­mat­ics markup when us­ing ams­math

This pack­age in­hibits the us­age of plain TeX and (on de­mand) of stan­dard LaTeX math­e­mat­ics en­vi­ron­ments. This is use­ful for class writ­ers who want to en­cour­age their users to use the en­vi­ron­ments pro­vided by the ams­math pack­age.