Xuan Huang
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 Sep17 awarded Notable Question Jul2 awarded Curious Sep8 awarded Popular Question Jul6 awarded Yearling Dec16 revised Sphere on plane deleted 15 characters in body; edited tags; edited title Dec16 revised Mixing things- ratios deleted 14 characters in body; edited title Dec11 suggested rejected edit on Partial Latin squares of even order Dec10 revised $k$ hands in $n$'s hair deleted 161 characters in body; edited title Dec10 revised Rotating equilateral triangles deleted 83 characters in body Dec9 revised Latin squares of even order-sub squares edited tags Dec9 revised Sudoku of different sizes deleted 325 characters in body; edited tags; edited title Nov22 awarded Investor Nov22 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. Nov16 revised $n$-ary trees with $k$-internal nodes - Catalan numbers latex was not marked with dollar signs Nov16 suggested approved edit on $n$-ary trees with $k$-internal nodes - Catalan numbers Nov5 asked Mixing things- ratios Nov5 awarded Peer Pressure Oct22 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. Oct21 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?: $3(3 a_{33}-3a_{23}+a_{13})-3(3 a_{32}-3a_{22}+a_{12})+(3 a_{31}-3a_{21}+a_{11}) =3(3a_{33}-3a_{32}+a_{31})-3(3a_{23}-3a_{22}+a_{21})+(3a_{13}-3a_{12}+a_{11})$. Oct19 comment Ordered quadruples in a grid @ChristianBlatter Are we using the conditions of the linear polynomial at all when doing our proof?