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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 low-rank matrix completion problem to integer programming?, Computer Science, April 18, 2017.

• Finding the gradient of the restricted function in terms of the gradient of the original function, September 23, 2021.

• Matrix exponential via Euler's formula, Mathematics, November 23, 2020.

• Second derivative of $$\det ( \mathrm I_n + t \mathrm A )$$, Mathematics, June 28, 2018.

• 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 3-8, 2017.

Profile picture courtesy of Erik Rauch. For rank-1-matrices, go here. One can label using, say, \label{eq1} and cite using \eqref{eq1}.

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