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 Apr 17 awarded Popular Question Mar 15 awarded Yearling Sep 30 awarded Explainer Mar 15 awarded Yearling Jun 25 awarded Excavator Mar 15 awarded Yearling Dec 8 awarded Popular Question Mar 15 awarded Yearling Apr 5 comment probability that a random element of Z/NZ can be written as a subset sum of others It seems to me like the question in the postscript asks for the probability that every element of $\mathbb{Z}/ N \mathbb{Z}$ can be written as a sum of some elements of $A$, whereas the original question asks for the probability that a particular element in $\mathbb{Z}/ N \mathbb{Z}$ can be written as a sum of some elements of $A$; which question are you really interested in? Apr 4 comment Finding cycle with constraints It might be helpful if you described your algorithm for cycles of even length. Also, what is the motivation? Apr 4 comment Finding cycle with constraints Please edit for typos and LaTeX. Such a cycle obviously need not exist -- what is the actual question you intend? Is this a homework assignment? Mar 24 comment volume of the projected body What sort of answer are you looking for? Mar 24 comment Fun question in additive combinatorics Yes, my mistake. Mar 24 comment Fun question in additive combinatorics Is this a question to which you already know the answer? Mar 24 comment Maximal number of directed edges in suitable simple graphs on $n$ vertices without directed triangles. gordon-royle, this is ruled out for $k \geq 2$ by the condition that there be no 2-cycles. Mar 22 comment Assigning positive edge weights to a graph so that the weight incident to each vertex is 1. @Didier Piau, good question! Mar 22 comment A density on the natural numbers invariant with respect to the multiplication Which is consistent with what I wrote: Gerald Edgar's density is the limit of a subsequence of the sequence whose limit is the usual density. Mar 22 revised Assigning positive edge weights to a graph so that the weight incident to each vertex is 1. added 88 characters in body Mar 22 revised Assigning positive edge weights to a graph so that the weight incident to each vertex is 1. added 222 characters in body Mar 22 comment Assigning positive edge weights to a graph so that the weight incident to each vertex is 1. Yes, that's correct. I'll edit to make it clearer.