Ricky Demer
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 2d reviewed Approve Why does it have to be an integer? Apr 29 comment Can we detect smoothness of a norm by its behavior along paths? I'm pretty sure the origin shouldn't be in $\alpha$'s codomain. ​ ​ Apr 28 comment Sum of probabilities is infinite Oh yes, I was wrong about the $P$ on the right of that implication. ​ However, the implication you have won't necessarily hold. ​ ​ ​ ​ Apr 28 comment Find Bayesian Nash Equilibria denotes ​ $\mapsto$ ​ "is an element of" ​ ​ ​ ? ​ ​ ​ ​ ​ ​ ​ ​ Apr 28 comment Particle in a box Apr 28 comment Sort the following functions according to order of growth I'm voting to close this post as not a question. ​ ​ Apr 28 comment Sum of probabilities is infinite Now, the $P$s on your $\implies$ line shouldn't be there, and even with them removed, I don't see why that line should hold. ​ ​ ​ ​ Apr 28 comment Sum of probabilities is infinite Unless they defined $P$ very strangely, there's an error in that question. ​ A probability is either a real number or undefined, not something that can be true or false. ​ ​ ​ ​ Apr 24 comment Is it possible that two metric spaces are metrically isomorphic but not homeomorphic. Metric isomorphisms are trivially continuous. ​ ​ Apr 14 comment Are Euclidean domains exactly the ones which we can define “mod” on? I'm talking about the mod function, for which outputs should be non-negative, at least when both inputs are positive. ​ ​ Apr 14 comment Are Euclidean domains exactly the ones which we can define “mod” on? By "non-trivial", I mean [[not isomorphic to the integers] and [has an ideal that's neither just {0} nor the whole ring]]. ​ $\mathbb{Q}[x]$ doesn't work because , for example, what would [x-1 mod x] be? ​ ​ ​ ​ Apr 14 comment Are Euclidean domains exactly the ones which we can define “mod” on? Side Note: ​ ​ ​ I found it non-obvious that there are any rings which non-trivially admit such modular reduction. ​ Can you come up with one before reading the answer to the question I asked about that? ​ ​ ​ ​ ​ ​ ​ ​ Apr 14 comment What happens if I repeatedly alternately normalize the rows and columns of a matrix? Are you interpreting "its" as the [row/column]'s or as M's? ​ ​ Apr 12 revised Is there any algorithm to find Isomorphism function between two graphs? fixed typos Apr 11 comment Continuity of Derivative at a point. @user1717828 : ​ ​ ​ en.wikipedia.org/wiki/Rational_number ​ mathworld.wolfram.com/SetDifference.html ​ ​ ​ ​ ​ ​ ​ ​ Apr 8 comment Can two 'different' vector spaces have the same vector? One can get "arbitrary elements in common" more easily: ​ Just consider a space with dimension greater than 1, and strict subspaces containing any given vector. ​ ​ ​ ​ Apr 7 accepted Is there a non-trivial ordered ring with an “integer-esque” modulo function? Apr 7 asked Is there a non-trivial ordered ring with an “integer-esque” modulo function? Apr 6 comment Are Euclidean domains exactly the ones which we can define “mod” on? @EliRose : ​ There's not necessarily a positive real one. ​ ​ ​ ​ Apr 4 comment How does one interpret statements like: “The traveling salesman problem is NP-complete?” For that matter, your next-to-last sentence is equivalent to ​ NP = coNP , ​ since that sentence's problem is trivially in coNP: There's a shorter tour if and only if T is not optimal. ​ ​ ​ ​