Top network posts

• 7 If $x * x = e$ for all $x$ and $(x_i * x_j) * (x_j*x_k) = x_i*x_k$, then $*$ is associative
• 7 Any equivalent to the Four color theorem for non-planar graphs?
• 7 Proof that no trading system always wins
• 7 Hardness of approximating Minimum Cardinality Exact Cover
• 6 Number of linear orderings of a set to have balanced frequencies of triple orders
• 6 Connection between chromatic number and independence number of a graph
• 6 size of an independent set of any graph with $n$ vertices and maximum degree $d$
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