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 Dec7 awarded Nice Answer Dec3 awarded Yearling Jun25 awarded Citizen Patrol May24 awarded Notable Question May13 awarded Notable Question Feb19 awarded Popular Question Jan24 awarded Necromancer Jan15 awarded Popular Question Dec16 awarded Enthusiast Dec9 comment An algebra of “integrals” Thanks! What if I just want this $T$ be defined on just a subspace? 1 is translational invariant, that certainly gives some trouble. ($\sin x$ seems to give similar trouble if one translate it by $\pi$.) Dec8 awarded Nice Question Dec8 revised An algebra of “integrals” clarified a bit. Dec8 comment An algebra of “integrals” I don't insist having something over $\mathbb{R}$. I just want to see if these kind of things may work. Dec8 revised An algebra of “integrals” added 17 characters in body; edited title Dec8 revised An algebra of “integrals” added 146 characters in body; edited tags Dec7 comment Groups that do not exist @Arturo, thanks for the correction, but I cannot edit the comment :(. Dec7 comment Groups that do not exist Great question. I wanted to ask something related, namely, what do we learn from those arguments that shows finite simple groups of a certain order does not exist? Those thing appear in abstract algebra course bothers beginners, and I'm not sure how useful they are for the training of a mathematician. (e.g. there cannot be a simple group of order 112, and it does not easily follow from Sylow theorems, but what's the point? (It does follow from the $p^aq^b$ theorem of Frobenius though.)) Dec7 asked An algebra of “integrals” Dec4 awarded Popular Question Dec3 awarded Yearling
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