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 3h revised Understanding a medieval approximation This may help. 4h revised Understanding a medieval approximation Well, that's in the Hebrew. I don't know what the original Arabic has. 4h comment Understanding a medieval approximation @Travis maybe (and nice find)… but then why? 5h asked Understanding a medieval approximation 2d comment Are there an infinite number of prime numbers where removing any number of digits leaves a prime? @Mindwin, no, the question was whether there are an infinite number, and this answer suffices as is to show there are not. Nothing needs to be added, and no addition (among the ones mentioned) will improve it. Apr 28 comment Why do we classify infinities in so many symbols and ideas? Your second displayed set is unclear. I know you meant that the list is infinite and is followed by 1, but the uninitiated might think it means the list is finite and ends with 1 (at least until midway through the next paragraph). You should clarify IMO. But +1: good explanation otherwise. Apr 22 revised When can we quit a game of War? "starting with" may be different. (In the "once he has" case, the extra cards he has are ones he's won and thus, in some sense, low-rank cards. I'd guess his chances of winning are therefore *less* then someone who *started* the game with that many cards) Apr 21 asked When can we quit a game of War? Jan 15 comment Is is possible to obtain exactly 16 black cells? @JesseWilliams, note that the sequence of operations you describe does the same as just choosing columns 1 and 3 (and not row 1 at all). That's what the answer means when it says "First notice that the order in which we perform the row/column operations doesn't matter and that using two times the same column/row does nothing.". Jan 4 comment Difficult Integral This answer would be much improved if it would include an explanation for the first equation: how you know that the LHS = something of the form of the RHS. Dec 21 awarded Yearling Dec 15 revised Where to make a conjunction instead of an implication? clearer, methinks Dec 15 revised Markov Process: predict the weather using a stochastic matrix edit in a necessary fact (which I gleaned from the sequel) Dec 15 suggested approved edit on Markov Process: predict the weather using a stochastic matrix Dec 15 suggested approved edit on Where to make a conjunction instead of an implication? Dec 13 revised Fundamentals of applications of limits in integration easier to read Dec 13 suggested approved edit on Fundamentals of applications of limits in integration Dec 9 comment If we randomly select 25 integers between 1 and 100, how many consecutive integers should we expect? Because the asker is interested in the expected number when most students have left, it makes sense to generalize this from $25$ to other numbers $k<100$ and even to values of $n$ different from $100$. The answer is always $k(k-1)/n$ pairs of students. It may be worth noting this in the answer. Nov 29 comment Exercise 18.3 from James Munkres' Topology, how should I interpret this question? @AlecTeal, yes. Nov 24 awarded Civic Duty