Top network posts

• 30 Suppose $M$ is an $m \times n$ matrix such that all rows and columns of $M$ sum to $1$. Show that $m=n$
• 28 Prove $|P(0)|\leq 2n+1$
• 27 Parts with the maximum number of each integer
• 18 Partition of 4-tuples
• 18 Tic-tac-toe with one mark type
• 16 Function of two sets intersection
• 16 Sum of roots rational but product irrational
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