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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 FixedPoint 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 padic 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. 