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Nontrivial trivial integrals

Let me phrase the proof for the first statement in modern language. Suppose that the sphere is $$\Sigma:=\lbrace x^2+y^2+z^2=1\;\rbrace, $$ and the cylinder is $$ C=\lbrace x^2+y^2=1\rbrace. $$ Fo …
Liviu Nicolaescu's user avatar