textcase – Case conversion ignoring mathematics, etc

The textcase pack­age of­fers com­mands \MakeTex­tUp­per­case and \MakeTex­tLow­er­case are sim­i­lar to the stan­dard \MakeUp­per­case and \MakeLow­er­case, but they do not change the case of any sec­tions of math­e­mat­ics, or the ar­gu­ments of \cite, \la­bel and \ref com­mands within the ar­gu­ment. A fur­ther com­mand \NoCaseChange does noth­ing but sup­press case change within its ar­gu­ment, so to force up­per­case of a sec­tion in­clud­ing an en­vi­ron­ment, one might say:   \MakeTex­tUp­per­case{...\NoCaseChange{\be­gin{foo}} ...\NoCaseChange{\end{foo}}...}