Xuan Huang
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 Apr 1 awarded Popular Question Sep 17 awarded Notable Question Jul 2 awarded Curious Sep 8 awarded Popular Question Jul 6 awarded Yearling Dec 16 revised Sphere on plane deleted 15 characters in body; edited tags; edited title Dec 16 revised Mixing things- ratios deleted 14 characters in body; edited title Dec 11 suggested rejected edit on Partial Latin squares of even order Dec 10 revised $k$ hands in $n$'s hair deleted 161 characters in body; edited title Dec 10 revised Rotating equilateral triangles deleted 83 characters in body Dec 9 revised Latin squares of even order-sub squares edited tags Dec 9 revised Sudoku of different sizes deleted 325 characters in body; edited tags; edited title Nov 22 awarded Investor Nov 22 comment Applying a Function to Square Matrices I would be interested in seeing further advances on this question. I will try to get further with the question as well. Nov 16 revised $n$-ary trees with $k$-internal nodes - Catalan numbers latex was not marked with dollar signs Nov 16 suggested approved edit on $n$-ary trees with $k$-internal nodes - Catalan numbers Nov 5 asked Mixing things- ratios Nov 5 awarded Peer Pressure Oct 22 comment Ordered quadruples in a grid @ChristianBlatter As far as I can see, you have reversed all the subscripts of $a$ in the step. I do not understand, however, why the step is true. Oct 21 comment Ordered quadruples in a grid @ChristianBlatter I am not entirely sure of the logic of this step either. Would you be able to explain?: $3(3 a_{33}-3a_{23}+a_{13})-3(3 a_{32}-3a_{22}+a_{12})+(3 a_{31}-3a_{21}+a_{11}) =3(3a_{33}-3a_{32}+a_{31})-3(3a_{23}-3a_{22}+a_{21})+(3a_{13}-3a_{12}+a_{11})$.