Stefan Kohl

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Hello, Stefan Kohl, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

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Square root of x formula. Symbol of mathematics.

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Again, welcome!  Deltahedron (talk) 18:13, 21 July 2014 (UTC)

Residue-class-wise affine group

You seem to have contributed almost all of this article, and it is sourced to papers by someone with the same name as you. You might like to review the guidelines at Wikipedia:Conflict of interest#Citing yourself. It would also help if you could find some independent reliable sources to help establish the notability of this topic. Deltahedron (talk) 18:13, 21 July 2014 (UTC)