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 May 20 suggested approved edit on Totally ordered abelian group May 20 comment Logic Puzzle of the age of three sons @Amy : see my answer to R. Israel. No this is not a standard, just a possible thought process of the problem's author. As these problems are supposed to make youngsters manipulate properties of integers, this made-up rule is a way to introduce the composite/prime distinction in the problem. May 20 comment Logic Puzzle of the age of three sons @Robert Israel: I agree with you, and I should not have presented my interpretation as if I believed that buildings are somehow figurate numbers. Just a hint or a trick toward a possible solution. As user6312 said, we are not doing mathematics here. We are just trying to outguess/reverse engineer a very vague and inconsistent fantasy world which is more or less shared among variants of these kinds of problem. This riddle is only a support for successive hypothesis and manipulation of integers, not a scientific slice of reality. May 19 comment Logic Puzzle of the age of three sons @svenkatr : You are right that this way was not listed. But if there is (one) older son, 1,6,6;13 is not possible. May 19 comment Logic Puzzle of the age of three sons @El'endia : a building has several floors with the same number of windows at each floor, so the number must be composite and not prime. May 19 comment A Question about p-primary Group @Arturo: I asked only to better understand etiquette on math.SE. May 19 awarded Tag Editor May 19 revised algebraic-topology wiki excerpt added 142 characters in body May 19 suggested approved edit on algebraic-topology tag wiki excerpt May 19 wiki created algebraic-topology excerpt May 19 revised Dual modules and first cohomology edited tags May 19 revised mathieu group M23? edited tags May 19 revised Inverse-closed subsets generating simple groups in finitely many steps edited tags May 19 revised Showing groups of order $p^{k}(p+1)$ are not simple, p prime edited tags May 19 revised Alternating and special orthogonal groups which are simple edited tags May 19 revised Simple Group Theory Question Regarding Sylow Theorems edited tags May 19 revised No simple group of order $300$ edited tags May 19 revised Why $PSL_3(\mathbb F_2)\cong PSL_2(\mathbb F_7)$? edited tags May 19 revised projective limit of simple groups edited tags May 19 revised questions about simple groups edited tags