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.
Matrix exponential via Euler's formula, Mathematics, November 23, 2020.
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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 81 Is "The empty set is a subset of any set" a convention?
 75 Why are some coins Reuleaux triangles?
 51 The relation between trace and determinant of a matrix
 39 How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
 30 What is a realworld metaphor for irrational numbers?
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