LaTeX has some handy macros that allow the insertion of diacritics and other special characters in text mode. Relevant tables from the Comprehensive LaTeX Symbol List:

These are handy since they don't require special input methods nor remembering unicode character numbers but, more importantly, mathematicians know and use them all the time. (I regularly get emails addressed "Dear Fran\c{c}ois"!) It would be nice if some useful subset of these were recognized on MathOverflow.

try already(but does not work). @Kaveh: there is a difference between using a (correct) transliteration and dropping diacritics. For example, on the Wiki page (the English one) it says Gödel,only this, on that of Markov one has Markov and the original. The correct way to write Gödel in English is like this; Godel is simply wrong (of course it is very minor error and should definitely be tolerated but it is still wrong) while using a correct transliteration is not wrong. $\endgroup$ – user9072 Jun 30 '13 at 11:54