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 Apr 1 comment Hypothesis for matrix formula @5xum: My guess is from a series expansion, assuming M positive definite. Apr 1 asked Hypothesis for matrix formula Mar 22 accepted Ambiguous definition of a set Mar 22 comment Ambiguous definition of a set Okay, nice perspective, indeed there is a non unique relationship between the quantity and its representation. Many thanks. Mar 22 asked Ambiguous definition of a set Mar 19 comment Intuition about the semidirect product of groups Sorry I can't give more details here and now but I advise to look into the Euclidean group as a good motivation for the semi direct product. Translations composed with rotations need for a semi direct product. Mar 2 accepted Map closed under addition but not multiplication Feb 19 asked Homomorphism theorem and group product Feb 15 asked Elementary exercise on cosets Feb 8 accepted Identifying a function Feb 8 asked Identifying a function Nov 29 awarded Popular Question Nov 6 asked Map closed under addition but not multiplication Oct 22 comment Distribution of the intersection between a grid and a circle Thanks for helping reformulating my problem, but shouldn't be $\lfloor R\rfloor$ in your inequality? Oct 21 asked Distribution of the intersection between a grid and a circle Sep 27 asked Looking for interesting problems to solve numerically Mar 19 comment Proof in ring homomorphism Thank you, it does make sense. Mar 19 accepted Proof in ring homomorphism Mar 19 asked Proof in ring homomorphism Mar 17 accepted Why are we losing one degree of freedom in this $\chi^2$ variable?