Dick Palais
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 May 31 awarded Popular Question May 30 comment A Canonical Form Theorem for $n$-forms? @Francesco YES ! I don't think you are missing anything---that is essentially the same proof as mine. I'll have to get Kobayashi's book from the library and have a look. Many thanks for this clue. May 30 comment A Canonical Form Theorem for $n$-forms? @Mariano. Right, that is the way I think of it, and it was Darboux Theorem that made me think it might be true. May 30 asked A Canonical Form Theorem for $n$-forms? May 24 awarded Notable Question May 24 awarded Nice Answer May 22 comment Why don't more mathematicians improve Wikipedia articles? @Mark M YES! That is a very good approximation of what I was asking for. Thanks for telling me about it. It is now one of my "pinned" tabs and I will try to help with the project. May 22 answered Why don't more mathematicians improve Wikipedia articles? May 17 comment Are there proofs that you feel you did not “understand” for a long time? How about the proof that Einstein is said to have (re)discovered as a teen-ager? It is clear that the areas of similar right triangles is proportional to the squares of corresponding sides---in particular to the squares of their hypotenuses. Dropping a perpendicular from the vertex of the right triangle onto the hypotenuse c divides it into two similar triangles with hypotenuses a and b, hence: kc^2 = ka^2 + k*b^2 so c^2 = a^2 + b^2 May 10 awarded Nice Answer May 2 answered A simple and good reference about solitons May 1 answered Does a *topological* manifold have an exhaustion by compact submanifolds with boundary? Apr 27 awarded Nice Answer Apr 26 awarded Good Answer Apr 20 awarded Necromancer Apr 20 comment Which hard mathematical problems do you have to solve to earn bitcoins ? Is it known whether there is an algorithm using a quantum computer (i.e., qubits instead of bits) for simplifying the Bitcoin mining? Apr 19 answered What are the invariant Pseudo-differential operators on a Lie group? Apr 19 revised Great mathematics books by pre-modern authors corrected misspelling Apr 19 answered Great mathematics books by pre-modern authors Apr 18 awarded Nice Answer