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  • 0 posts edited
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  • 192 votes cast
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...
Dec
5
comment Finding the function of the power series $\sum\limits _{n=1}^{\infty}\frac{x^{2n+1}}{n}$
That's a lot simpler than my way...