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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

13 votes

Proposals for polymath projects

Covering Arrays are combinatorial objects that have applications in Computer Science among other fields, specifically in software and hardware testing. The definition is a 4-tuple $CA(N;t,k,v)$, where …
3 votes

Proposals for polymath projects

Consider a probabilistic graph $G = (V, E)$ where each edge operates (exists) with probability $p$, independent of other edges. We consider a set $S \subseteq E$ to be a state of $G$. We say that $S$ …