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Well, as nobody wants to answer ... I have to answer myself after I tried out several things and asked many people.
The problem lies in the also included package eulervm which changes the font-style to another (for me it looks not good) style. In contrast to that one can use amssymb if one wants to ...

Hello there!

I'd like to change my math font-style but as I am new to latex I have some problems with it.
I use also the algorithm and algorithmic packages.
My problem is the follows: normally math-letters should be displayed in a such a way that it differs from the normal text. In the files I have ...