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Apr
4
accepted Can non-isomorphic field extensions be isomorphic fields?
Apr
4
asked Can non-isomorphic field extensions be isomorphic fields?
Mar
26
revised Do all $L^{\infty}(\mu)$ spaces have the Grothendieck property?
copy-editing
Mar
26
comment Minimum Spanning Tree of Graph with Unknown Weights
Is the graph directed? $\:$ If no, then there are only $(n\cdot (n\hspace{-0.04 in}-\hspace{-0.05 in}1))/2$ edge weights. $\;\;\;\;$
Mar
9
accepted $n$-in-a-row game on $\mathbb{R}^2$
Mar
3
comment Starting Hilbert's Program on the other end
@LucasK. : $\:$ If you can't drop them, then they're not unnecessary. $\;\;\;\;$
Mar
2
comment Is every graph the center of some other graph?
You don't actually need "long line"s of vertices, you can just attach another vertex to each of A and B. $\hspace{.6 in}$
Feb
28
accepted Can Haar measure fail to be bi-invariant without conjugation shrinking a set?
Feb
28
revised Can Haar measure fail to be bi-invariant without conjugation shrinking a set?
fixed grammar error caused by previous edit and reverted some spacing changes
Feb
28
comment quantitative version of the rigidity of the 2-sphere
closed $\mapsto$ close $\:$ ? $\;\;\;\;$
Feb
28
asked Can Haar measure fail to be bi-invariant without conjugation shrinking a set?
Jan
31
awarded  Nice Question
Jan
20
awarded  Popular Question
Jan
16
comment Can a unit square be cut into rectangles that tile a rectangle with irrational sides?
Oh yeah. $\:$ (Although, presumably there should be a comma between $1/r$ and $a_1$.) $\hspace{1.4 in}$
Jan
16
comment Can a unit square be cut into rectangles that tile a rectangle with irrational sides?
In this particular case, one can replace "$f : \mathbb{R} \to \mathbb{R}$ be an additive group homomorphism" and "the Axiom of Choice" with "$f : \operatorname{span}_{\mathbb{Q}}(\{1,r,1/r\}) \to \mathbb{Q}$ be a linear map" and "linear algebra" respectively. $\:$ (That modification is what Clément described, although $\operatorname{span}_{\mathbb{Q}}$ is notation that I just made up.) $\:$ I do not know how to show a strong enough version of Schoenfield Absoluteness to deduce that result as a consequence, but I do know how to show that theorem's $\Sigma^1_1$ and $\Pi^1_1$ versions. $\;\;\;$
Jan
16
comment Can a unit square be cut into rectangles that tile a rectangle with irrational sides?
@DouglasZare : $\:$ Try applying that argument to "There does not exist a counter-example to AC." $\hspace{.59 in}$
Jan
10
comment Most 'obvious' open problems in complexity theory
@RyanO'Donnell : $\:$ This paper was published almost 2 years after you answered (by the other person who commented on this answer, which I almost didn't notice) and resolves your second example. $\;\;\;\;$
Jan
2
accepted Can the Law of the Iterated Logarithm be strengthened?
Jan
2
awarded  Nice Question
Dec
5
awarded  Popular Question