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English is not my native tongue. German is not my native tongue. French is not my native tongue.
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I discovered something, what do I do?
Making a mathematical discovery usually presumes familiarity with the subject, in particular knowing the names of some experts in that area. I recommend that you contact some experts by email (you can find the email addresses of authors at the end of a mathematical paper), who will tell you if your result is really new and worth publishing. The canonical route, by the way, is to simply submit to a journal whose editors then assign the manuscript to a professional referee. So even if you cannot contact anybody, you will get feedback on your work. 
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Segal's 1999 Stanford lecture notes on TQFT, where to find them?
@ShahroozJanbaz: At archive.org you enter the old link and you get the archived link by the system. More precisely, you can go back in time, so there are several archived links. 
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Segal's 1999 Stanford lecture notes on TQFT, where to find them?
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Sums of reciprocals involving divisor sums
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Need an explanation of a deduction
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Need an explanation of a deduction
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answered  Need an explanation of a deduction 
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LaplaceBeltrami and averaging
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awarded  Nice Answer 
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Number of distinct factors
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answered  Number of distinct factors 
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Number of distinct factors
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awarded  Nice Answer 
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If the Riemann Hypothesis fails, must it fail infinitely often?
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awarded  Enlightened 
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awarded  Nice Answer 
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is this formula correct
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is this formula correct
@GeraldEdgar: I think he did not learn properly the chain rule for several variables. 
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is this formula correct
I answered your question below. Note that this site is for research level questions. For general questions in mathematics see math.stackexchange.com 
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answered  is this formula correct 