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A sum over lattice parallelograms of area one is equal to $\pi$ nt.number-theoryreference-requestlatticeszeta-functions Tim Allen 21 answered 22 mins ago 3 votes 0 answers 16 views On the Gram matrix of $6$ unit vectors in $\Bbb R^3$ real-analysismg.metric-geometryinequalitiesreal-algebraic-geometry Iosif Pinelis 123k modified 26 mins ago 0 votes 0 answers 7 views Sufficient condition for weak convergence in Banach spaces fa.functional-analysisbanach-spaces an_ordinary_mathematician 2,230 asked 26 mins ago 6 votes 2 answers 349 views Why believe in the existence of large cardinals rather than just their consistency? set-theorylarge-cardinals Vincent R.B. 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