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Jan
3
revised $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
added 8 characters in body
Jan
3
answered $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
Jan
3
comment $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
@fretty: $n$ can be $0$.
Jan
3
comment Diagonalization versus s.d. product for non-commuting Hermitian matrices
@nomadreid: Yes, they are equivalent, which is what I have shown in my post. First, I have shown that $[A, B] \neq 0$ is equivalent to (1) and then, I have given you the theorem that it is also equivalent to (2). Because equivalence of statements is an equivalence relation, (1) and (2) are equivalent to each other. This also applies to your third point: The point of my post was to show that (1) and (2) are not just consequences of $A$ and $B$ being non-commutative, but all three statements are equivalent!
Jan
3
revised Inversible Antisymmetric Matrix
added 21 characters in body; edited tags
Jan
3
answered Inversible Antisymmetric Matrix
Jan
3
answered Why $\|Ax\|^2=\frac{1}{4}\left(2\left<A(\beta x), v\right>+2\left<Av,\beta x\right>\right)$
Jan
3
revised System of vectors $\{f_1, f_2, \ldots, f_n\} \in V^*$ is a basis of $V^*$ if and only if $\ker f_1 \cap \ker f_2 …\cap \ker f_n = \{0\}$
formatting
Jan
3
reviewed Approve Near-rings: why are ideals defined like that?
Jan
3
reviewed Approve Regression vs Classification
Jan
3
reviewed No Action Needed Equation of a cubic function with inflection point on (0.5,0.5) and contains (0,0), (1,1)
Jan
2
comment Diagonalization versus s.d. product for non-commuting Hermitian matrices
@nomadreid: Which bases do you mean? My point was that both statement (1) and (2) are equivalent to $[A,B] \neq 0$, in case it wasn't clear. I thought you were trying to understand how one comes up with these two results.
Jan
2
revised double angle condition
added 41 characters in body
Jan
2
comment If A is an open set does A the complement of A have to be closed? I know the opossite is true by definition, is this?
A set is closed if its complement is open.
Jan
2
revised Does order of qualifiers matter in FOL formula?
added 48 characters in body
Jan
2
comment How does $\sum_{k=0}^n (pe^t)^k{n\choose k}(1-p)^{n-k} = (pe^t+1-p)^n$?
en.wikipedia.org/wiki/Binomial_theorem#Statement_of_the_theorem
Jan
2
revised Integral $\int_0^\infty \frac{\sqrt[3]{x+1} - \sqrt[3]{x}}{\sqrt{x}} \, \mathrm dx$
added 43 characters in body
Jan
2
reviewed Approve A p-Sylow subgroup of a subgroup is a p-sylow subgroup of the group
Jan
2
comment The set of the roots of all polynomials in one variable with integer coefficients
What have you tried so far?
Jan
2
revised Poincaré inequality by capacity estimate.
added 80 characters in body; edited title