Ghosha
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Ghosha
I agree that this is my problem :b Many thanks for these examples, they helped to figure it out!
Just in case, I'll leave it here as examples: Logipedia – Encyclopedia of Formal Proofs http://logipedia.inria.fr/ Post about it in HN https://news.ycombinator.com/item?id=19413195 witk several useful links as http://us.metamath.org/
Thank you for quick respond! I will try ASAP and report results.