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Nov
2
awarded  Nice Answer
Nov
2
awarded  Nice Question
Nov
1
answered Most memorable titles
Oct
27
revised P-adic L functions
minor LaTeX fix
Oct
12
comment roots of permutations
True. My answer attempts to generalize further into equations in several variables.
Oct
12
answered roots of permutations
Sep
30
awarded  Yearling
Sep
19
comment A conjectured criterion for 4-colorable graphs
It's even falser :-) In fact, there are graphs with high girth and high chromatic number. A graph with high girth looks like a tree around any vertex, so it avoids much more than just triangles. Proving that such graphs exist is perhaps even simpler than the explicit construction by Mycielski; it's basically a counting argument.
Sep
11
awarded  Nice Answer
Sep
10
answered What is the easiest randomized algorithm to motivate to the layperson?
Aug
28
revised Does the “continuous locus” of a function have any nice properties?
added 39 characters in body
Aug
5
comment Approaches to Riemann hypothesis using methods outside number theory
Is the "hidden operator" approach initiated by Dyson and Montgomery subsumed in the the Bost-Connes approach? en.wikipedia.org/wiki/Hilbert%E2%80%93P%C3%B3lya_conjecture
Jul
15
awarded  Civic Duty
Jul
9
comment How thick is the reciprocal of the squares
In the OEIS entry there's a comment by Frank Adams-Watters citing your paper. The first statement in the comment is "This set has zero density". Presumably this is wrong, and worth correcting? research.att.com/~njas/sequences/A108345
Jul
9
answered Problem suggestions for polymath for undergraduates research
Jul
3
awarded  Popular Question
Jun
28
revised Semisimple-ish rings!
changed M to I in "I subseteq J(R)"
Jun
26
answered Pseudo-random number generation algorithms
Jun
24
comment What's wrong with the surreals?
I actually remember one more disadvantage mention by Conway: equality is a defined relation, and a pretty subtle one at that. It's not too easy to figure out when two expressions for surreal numbers are actually equal.
Jun
20
comment What can be tiled by T-tetrominoes?
The paper "Tiling rectangles with T-tetrominoes" by Korn and Pak seems to present some progress for non-rectangular simply-connected regions, mainly Theorem 11 in section 8. It doesn't seem like they have a complete answer though. citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.70.6847