Rodrigo de Azevedo
Some answers I particularly enjoyed writing:
How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?, Mathematics, May 18, 2016.
How to reduce the lowrank matrix completion problem to integer programming?, Computer Science, April 18, 2017.
Toeplitz matrix nearest to a given (symmetric) matrix, MathOverflow, March 15, 2018.
Writing $(x^2 + y^2 + z^2)^2  3 ( x^3 y + y^3 z + z^3 x)$ as a sum of two squares of quadratic forms, Mathematics, September 38, 2017.
Profile picture courtesy of Erik Rauch.

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Last seen Dec 22 '19 at 22:04
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 34 How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
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