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 Mar 16 asked Directional derivative of determinant at the identity is the trace of the matrix? Jan 2 accepted Using Lagrange's diagonalization on degenerate linear forms Jan 2 comment Derivative of the function $(x)!$. the $n^{\rm{th}}$ derivative of $x^n$ is $n!$, which is a natural number, it's not a function in $x$ Jan 2 asked Using Lagrange's diagonalization on degenerate linear forms Dec 29 comment Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$ That makes sense.. Had troubles using the fact S is diagonalizable, but this makes it doable for me. Dec 29 comment Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$ @orangeskid love to see a proof of the general case. As I'm still shakey on this specific case don't think I'll be able to prove it myself Dec 29 comment Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$ @Omnomnomnom didn't know that. Thanks. English is not my native language Dec 29 accepted Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$ Dec 28 asked Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$ Dec 25 accepted Linear transformations preserve the squared sum of norms of orthonormal bases Dec 24 asked Linear transformations preserve the squared sum of norms of orthonormal bases Dec 22 accepted All the ternary n-words with an even sum of digits and a zero. Dec 21 comment All the ternary n-words with an even sum of digits and a zero. About your addition: This is exactly what I did originally, but what about even strings of lenght n-1 with zeroes? you can add 1 to then, so I also need $f(n)$ in the definition of f-bar, which puts me in a loop Dec 21 comment All the ternary n-words with an even sum of digits and a zero. got it specifically for n=1 with starting condition f(0)=1 because of the 2. And yeah.. f-bar is wrong. always confused by these... Dec 21 asked All the ternary n-words with an even sum of digits and a zero. Dec 20 accepted All the binary n-words without the sequence 011 Dec 19 asked All the binary n-words without the sequence 011 Dec 12 awarded Tumbleweed Dec 5 asked Relation of Smith normal form to basis of subgroup Dec 5 comment Finding suitable basis for a free abelian finitely generated group. It looks like I am taking the exact same course exactly a year later, as the question fits the one appearing on my homework, no one explained anything about Smith normal form to us, and I have no idea what do to.. (also your name fits the area :P). Let's hope the single answer here will help me get on my way...