I believe that some mathcal fonts may have the lower case, and some others do not. In particular, I know that mathptmx does not have lower case, but I'm not sure which fonts might have lower case.
Ben. On Tue, Aug 13, 2002 at 12:16:46PM +0200, S.K. Tomar wrote: > Andre Poenitz wrote: > > > > No, certainly not. I had a different output from "r" then > > > what I get with "R". > > > > Oh... but both "calligraphic"? > > > > Do you have a screenshot? > > Yes, both "caligraphic". I can't see anything in this screenshot (the text is too small). Anyway, \mathcal only works with uppercase letter!