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visits member for 5 years, 8 months
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11h
reviewed Reopen Properties of schemes determined by field valued points
11h
reviewed Leave Closed What is known about order of torsion of jacobian of hyperelliptic curve over finite field?
11h
reviewed Approve Convergence of Fixed-Point Iteration of a dependent map
11h
comment About properties of polynomials with common interlacing
(Oops, in my previous comment, I meant to assume $k$ is even, so that $a_1^k$ and $b_n^k$ will predominate.)
14h
comment About properties of polynomials with common interlacing
Thanks. Now I am not sure I understand the quantifiers. For suitable $a_i$ and $b_i$, you could have the equation hold for arbitrarily large k: just make $a_1 << 0$ and $b_n >>0$, and then tune their values to make the equation hold (while fixing the other values).
2d
comment About properties of polynomials with common interlacing
What does "have a common interlacing" mean?
May
3
reviewed Close Morphism in derived category
May
3
reviewed Close Uniqueness of a smooth function
May
3
reviewed Leave Open What defines a “short proof”?
May
3
comment Extending subsets to supersets in different ways
That"s a much simpler way to put it than occurred to me, thank you!
May
2
comment A question about simple closed curves in finite dimensional Euclidean spaces
I guess you meant for $p$ to be degree $n$. (If the degree is smaller, the curve goes off to infinity, and if the degree is bigger, the number of intersections could go up.)
May
2
awarded  Custodian
May
2
reviewed Reopen Describe the desired features of a “Mathematics Colloquium”?
May
2
answered Extending subsets to supersets in different ways
May
2
reviewed Close Dimension of Ext modules
May
1
reviewed Leave Open Fixed point theorem in ordered spaces
May
1
reviewed No Action Needed Extending subsets to supersets in different ways
Apr
5
reviewed Leave Open “frequency” of fields for which the p-adic regulator vanishes (mod p)
Apr
5
reviewed Approve Intuition and/or visualisation of Ito integral/Ito's lemma
Apr
3
comment Finding commuting matrices
@JoonasIlmavirta That can't be right, since certainly scalar multiples of the identity commute with both $A$ and $B$. The feeling I have is rather that the eigenspaces of a matrix commuting with $A$ and $B$ should be big. Also, whether an eigenvalue is zero or not shouldn't matter, since $M$ will commute with $A$ and $B$ iff $\lambda I + M$ does.