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 Mar 9 revised Why are the sporadic simple groups HUGE? added 2 characters in body Mar 9 comment If $2^x$and $3^x$ are integers, must $x$ be as well? This answer was given by Gerry. I just added the link to Wikipedia. Mar 9 revised If $2^x$and $3^x$ are integers, must $x$ be as well? Added wikipedia link Mar 9 comment If $2^x$and $3^x$ are integers, must $x$ be as well? Very interesting! Just to make sure I understand - does this generalize the "n^x for all n" version only, or can it be applied to "2,3,5" and "2,3" as well? Mar 9 accepted If $2^x$and $3^x$ are integers, must $x$ be as well? Mar 9 comment If $2^x$and $3^x$ are integers, must $x$ be as well? @jef: the best hint I can think of is "calculus of differences". Mar 9 awarded Good Question Mar 9 awarded Nice Question Mar 9 asked If $2^x$and $3^x$ are integers, must $x$ be as well? Mar 8 comment Criteria for accepting an invitation to become an editor of a scientific journal I think the following criterion is somewhat rational: when the publishers of a new journal solicit help for the editorial board, they understand that people will be asking themselves exactly the kind of question you are asking. Therefore they make an effort to establish the reputation of the new journal in the email - providing references to editors who have already joined, explaining why a new journal in this field is called for, contrasting it with similar journals etc. On the other hand they don't say anything about the submission process since this is completely irrelevant. Mar 6 answered Teaching Methods and Evaluating them Mar 3 comment Diameter of m-fold cover I must be missing something - why do you say that L(bi) < L(ai) in the second paragraph? Why is that a strict inequality? Feb 19 revised How should I approximate real numbers by algebraic ones? deleted 1 characters in body Feb 17 comment Examples of eventual counterexamples Pretty impressive! Specifically, gcd(n^17+9, (n+1)^17+9)=1 for all n up to some crazy explicit number, the number of digits of which I couldn't even count. This begs the question, is there a reasonably simple proof that this gcd isn't always 1? Feb 17 comment Describe a tree by junctions Perhaps it's just me, but I'm completely unable to parse this. Could you perhaps explain what you mean by sectors, infinite branches, junctions and what is the tree? A picture, perhaps? Feb 17 comment Mathematical solution for a two-player single-suit trick taking game? @Sam, I just corrected that. Feb 17 revised Mathematical solution for a two-player single-suit trick taking game? added 1 characters in body Feb 13 comment Dividing a square into 5 equal squares That's really neat! Feb 12 comment Unique factorization in polynomial rings Read literally, one cannot even state (let alone prove) #1 without having a notion of a "field" which I imagine would disqualify both Euclid and Guass. The first general definition of a field is by Weber (1891) according to Wikipedia. Earlier notions were things like a subfield of the complex numbers. I'm not sure if the question assumes that the prover knew they were working over general fields, or rather looking for proofs which are essentially independent of the base field (even if they were formulated over a specific field). Feb 12 comment What are the most overloaded words in mathematics? That's right - thanks!