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Trying \mathcal{X} or \mathcal{S} does not bring me the caligraphic letters i am searching for. I am searching for these "special" X'es and S'es you can see in the two following pictures:

Special X Special S

Can anyone explain me which font or command to use to get these caligraphic letters?

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up vote 7 down vote accepted

You can load the package mathrsfs. Different examples you can find in the Comprehensive LaTeX Symbol List

$\mathscr{X}$ und $\mathscr{S}$

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Thanks for the answer and this PDF - it will help me find some symbols like the imaginary unit i without a dot which I am searchong for :D – Christian Ivicevic Aug 7 '11 at 12:51
Christian: Try \i. – Ant Aug 7 '11 at 17:09
Don't forget that Detexify can save you some time! – DJP Aug 7 '11 at 17:16

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