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A student offered to let me read my letter of recommendation for a mentorship award

united-states recommendation-letter asked Sep 24, 2021 at 1:09

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Prove that idempotency is a necessary and sufficient condition for a densiy matrix to be N-representable

quantum-chemistry asked Jun 26, 2019 at 23:44

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Is idempotency, $\rho^2=\rho$, a necessary and sufficient condition for $\rho$ to be a pure state?

quantum-mechanics homework-and-exercises hilbert-space quantum-information density-operator asked Jun 27, 2019 at 1:23

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Zeroes of $\sin(z)+2\sin(8z)$

complex-analysis roots asked Feb 4, 2019 at 22:40

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Top Answers

Creating a Hyperbola with a Flashlight

math.stackexchange.com

Prove that if the sum $S=\sum_{n=1}^{\infty}\frac{1}{n^2}$ then, $1+\frac{1}{3^2}+\frac{1}{5^2}+\frac{1}{7^2}+\dots=\frac{3}{4}S$

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Calculating average value of a signal

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What is the difference between a force and a net force?

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