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Feb 17, 2017 at 17:55 comment added Pat Devlin @JairoBochi : Computing the probability that $P=0$ is a long-standing open problem with lots of intermediate progress and literature on the subject. Do a google search for the very related question asking "what's the probability that a random matrix is singular" [the answer there is conjectured to be roughly equal to the probability that two rows or columns are linearly independent]. In fact, it was hard even to show that $P=0$ is unlikely! (See, e.g., terrytao.files.wordpress.com/2008/04/permanent.pdf among many others.)
Feb 17, 2017 at 6:46 comment added Fedor Petrov for fixed $\pi$, we vary $\sigma$, and $\tau:=\pi^{-1}\sigma$ runs over all permutations
Feb 17, 2017 at 5:39 comment added Turbo @FedorPetrov how did you go from sum over $\tau$ to sum over $i$?
Feb 16, 2017 at 13:51 comment added Jairo Bochi Is it possible to explicitly compute the probability of P=0?
Feb 16, 2017 at 13:23 history edited Fedor Petrov CC BY-SA 3.0
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Feb 16, 2017 at 12:53 comment added Jairo Bochi You mean, close to $(\mathbb{E} P)^2$.
Feb 16, 2017 at 12:20 history answered Fedor Petrov CC BY-SA 3.0