Alon Amit
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 Jun 18 comment Gently falling functions Sorry if that's a silly question but in example 1), a particle starting at (0,1) won't go anywhere unless you give it some initial horizontal velocity. Are you suggesting that the separation point tends to the indicated point as that velocity tends to 0? Jun 17 comment Proof that any NP problem can be reduced (in P time) to any problem in NPC? I don't understand your modified question. Of course every problem in NP can be reduced some subset of NP problems - it can be "reduced" to itself, and often to lots of other problems polynomially-equivalent to it. Why does that imply that NPC is empty? Jun 11 comment Is there any sequence $a_n$ of nonnegative numbers for which $\sum_{n \geq 1}a_n^2 <\infty$ and $\sum_{n \geq 1}\left(\sum_{k \geq 1}\frac{a_{kn}}{k}\right)^2=\infty$? In line 3, did you mean "the sequence whose $n$-th term is..."? Jun 3 comment Examples of theorems misapplied to non-mathematical contexts If he does, it's a slam dunk. Jun 1 answered Examples of theorems misapplied to non-mathematical contexts Jun 1 answered Examples of theorems misapplied to non-mathematical contexts May 19 awarded Nice Answer Apr 20 awarded Popular Question Apr 18 comment Proof of no rational point on Selmer's Curve 3x^3+4y^3+5z^3=0 @Ho Chung Siu, do you happen to have a copy of that paper anywhere accessible? Apr 18 awarded Nice Question Apr 14 comment What is the high-concept explanation on why real numbers are useful in number theory? This is totally tangential but I just want to say I strongly disagree with the sentiment of the first sentence. If statements and proofs were typically "in the same world", math would be so dull. Dystopia. Apr 10 comment Motivation behind Tutte's 1-factor theorem I changed the question's title to better correspond to its content. You don't appear to be interested in the historical development of the theorem, but rather the motivation behind this characterization. Perhaps a better way to phrase the question would be to ask, is there any algorithmic or theoretical advantage to this (rather daunting) condition. Apr 10 revised Motivation behind Tutte's 1-factor theorem Changing the title to better reflect the content of the question. Mar 9 awarded Notable Question Feb 15 awarded Nice Answer Jan 11 answered About an exercise in Serre's “Trees” Jan 4 comment Is “second-countable implies separable” equivalent to the Axiom of countable Choice? Surely this requires only the axiom of countable choice? Dec 22 awarded Nice Answer Dec 8 comment How many finite simple groups of order $p+1$? n!/2-1 is prime for n=5, 6, 9, 31, 41, 373 ... (sequence A082671 on the OEIS). Is it known if this sequence is finite? Dec 5 awarded Nice Answer