# I know it's painful, but could someone check my math?

• As the commentor of (math.se) dxiv stated, unless the matrix is symmetric; $A = A^{T}$, the equality wont hold. Cause the left side is summing the lower triangular elements while the right side is summing the upper triangular elements. This assumes that for the element $a_{nk}$, $n$ stands for rows and $k$ stands for $columns$. – Fat32 Sep 6 '18 at 22:57