Paul Christiano
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 Feb 24 awarded Popular Question Mar 24 awarded Benefactor Mar 19 accepted Are gaussians with different moments far in total variation distance? Mar 19 comment Are gaussians with different moments far in total variation distance? Thanks! I'll give this the bounty unless a significantly cleaner solution crops up (unless there is some etiquette about this I don't know). Minor (I think) issue: the covariance matrices can have eigenvalues more than 1. But you only need to apply this bound for sparse vectors, so it looks like you are good. Mar 18 comment Are gaussians with different moments far in total variation distance? Suvrit: it's a big integral, of the absolute value of the difference between the Gaussian densities. I don't really see how to simplify it usefully, and writing it out is a mess. Mar 18 revised Are gaussians with different moments far in total variation distance? Added remark about 2 dimensional case. Mar 18 comment Are gaussians with different moments far in total variation distance? I certainly should have made that observation... I don't see how to do this nicely even in the case of 2 dimensional Gaussians, but upon consideration it does seem like that should be much easier. Mar 18 awarded Nice Question Mar 17 awarded Promoter Mar 15 comment Are gaussians with different moments far in total variation distance? No; together with the strong concavity of the entropy it might give an alternative and conceptually clearer proof of this claim, in which I am once again interested. What suggests this might be a homework problem? Mar 14 revised Are gaussians with different moments far in total variation distance? edited body; edited title Mar 14 asked Are gaussians with different moments far in total variation distance? Nov 8 awarded Self-Learner Oct 30 comment An approximate infinite-dimensional fixed point theorem This is surely too much to ask, but do you know what happens if every coordinate of $f$ is continuous in the product topology, except for one of them? Intuitively there are two kinds of obstructions from infinite dimension, and it seems like this eliminates one of them (we no longer have to intersect infinitely many sets in a non-compact space). I don't understand the counterexamples to the approximate fixed point property well enough to see whether they work in this setting. (For my purposes, this case would be almost as good as the whole thing.) Oct 29 accepted An approximate infinite-dimensional fixed point theorem Oct 28 awarded Teacher Oct 27 answered An approximate infinite-dimensional fixed point theorem Oct 27 accepted Infinite-dimensional hex Oct 27 comment Infinite-dimensional hex Yes, if the players alternate turns, then everyone only plays once. Calling it a "game" is a bit of a stretch. Oct 26 answered Infinite-dimensional hex