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 May 3 asked For which graphs the quantum chromatic number are known. May 2 asked What is the orthogonal rank of Grötzsch graph? May 1 comment An example of vertex transitive graph whose chromatic number and clique number is apart. I mean undirected graph May 1 comment An example of vertex transitive graph whose chromatic number and clique number is apart. i basically known only Grötzsch graph graph, but it is too big, i want small graph have the property that the chromatic number and clique number differ more than 2. May 1 asked An example of vertex transitive graph whose chromatic number and clique number is apart. Aug 8 comment How to count the $r$-tuples of subsets of $\{1,\dots,n\}$ that are cyclically disjoint? Yes, that is right! 12 was a mistake. Aug 8 comment How to count the $r$-tuples of subsets of $\{1,\dots,n\}$ that are cyclically disjoint? And I know the next is 12, so the sequence is 2,3,4,7, 12,... Aug 8 comment How to count the $r$-tuples of subsets of $\{1,\dots,n\}$ that are cyclically disjoint? a nice view, thanks. Aug 7 comment How to count the $r$-tuples of subsets of $\{1,\dots,n\}$ that are cyclically disjoint? no, the condition is not Si∩Sj=∅ for any i and j, but for j=i+1 and so on. Aug 7 asked How to count the $r$-tuples of subsets of $\{1,\dots,n\}$ that are cyclically disjoint? Jul 22 comment How many different choice of sets? This is very clear, thank you! Jul 22 comment How many different choice of sets? this is definitely true, but the problem is how to simplify it. Jul 19 awarded Curious Jul 18 comment How many different choice of sets? $i≠j⇒Si∩Sj=∅$ is not demanded. Only when $i=j+1,Si∩Sj=∅$ is demanded. And permutations of $S_i$ is counted. Jul 18 revised How many different choice of sets? deleted 2 characters in body Jul 18 awarded Commentator Jul 18 comment How many different choice of sets? Sorry I do forget to add the condition that S_i is nonempty. But I do not think the first answer is correct anyway. Jul 18 revised How many different choice of sets? added 30 characters in body Jul 18 asked How many different choice of sets? Jul 16 revised How many positive integer solutions are there to the inequality $x_1+x_2+…+x_r\le n$? added 122 characters in body