>>213551584
Don't pretend you know anything about math Mr Amerifat. You guys learn about derivation only in college (2nd year of high school here, used to be 1st year).
You're right about the frequency of Russian names being higher though. In my original message I was thinking more of school textbooks while the focus shifted to more advanced textbooks.
Yet I will tell it to you again : don't pretend you know anything about math and topology in particular otherwise you wouldn't have named Poincaré when I named Lebesgue earlier. You would know what Lebesgue and Borel Sigma-Algebras are. And in fact you would know Analysis and Topology are connected through results you can thank these two mathematicians for, both French.