Neil G
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 Nov 24 comment Number of nodes on diagonal planes of a cube Thanks......... Nov 24 accepted Number of nodes on diagonal planes of a cube Nov 24 comment Number of nodes on diagonal planes of a cube ... or maybe $\binom{A}{2} - 3\binom{B}{2} - 3\binom{C}{2}$ Nov 24 comment Number of nodes on diagonal planes of a cube @Rahul: Right, I see that now. So, the solution will be of the form (A choose 2) - 3 (B choose 2)? Nov 24 asked Number of nodes on diagonal planes of a cube Nov 9 answered About a weighted sum of hitting times for random walks on graphs Nov 3 comment Chinese remainder theorem How do you justify the second sentence? Nov 3 comment Chinese remainder theorem I have added it. Please let me know if it's correct. Nov 3 answered Chinese remainder theorem Nov 3 comment Chinese remainder theorem Yes, I will add it as a solution. Nov 3 accepted Chinese remainder theorem Nov 3 revised Chinese remainder theorem Forgot a condition Nov 3 comment Chinese remainder theorem I will update the question. (This problem is a part of a larger problem and I forgot the conditions that I'd used.) Nov 3 asked Chinese remainder theorem Oct 28 accepted What is an example of a lambda-system that is not a sigma algebra? Oct 28 comment What is an example of a lambda-system that is not a sigma algebra? Even though both answers are correct, I'm going to mark this answer because it gives me a bit of intuition about what's going. The other answer would have been a better solution to an exam question. Oct 28 comment What is an example of a lambda-system that is not a sigma algebra? I think you only need relative complement of included sets? I.e., $A \subseteq B \Rightarrow B \setminus A \in L$. Oct 28 asked What is an example of a lambda-system that is not a sigma algebra? Sep 21 comment Example where union of increasing sigma algebras is not a sigma algebra Not to me :) But, even if I were one of your students, I don't think this question goes beyond what students would discuss between themselves. Sep 21 accepted Why are the sets of rational and irrational numbers Borel sets (over the reals)?