Anders Kaseorg

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Is $\sum_{a=0}^m\sum_{b=0}^n\cos(abx)$ always positive?

Oct 24, 2021

Show that $\left(\frac{x_1^{x_2}}{x_2}\right)^p+\left(\frac{x_2^{x_3}}{x_3}\right)^p+\cdots+\left(\frac{x_n^{x_1}}{x_1}\right)^p\ge n$ for any $p\ge1$

Nov 1, 2021

How few $(42^\circ,60^\circ,78^\circ)$ triangles can an equilateral triangle be divided into?

Jan 11, 2021

Four Dragon Curves are Edge-covering/Plane-tiling

Jan 7, 2019

Geometric proof of $\cos A + \cos B + \cos C + \cos (A+B+C) = 4 \cos \frac{A+B}{2} \cos \frac{B+C}{2} \cos \frac{A+C}{2}$

Sep 28, 2021

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Defining the Cosine Function from First Principles, intuitively

+10

How few $(42^\circ,60^\circ,78^\circ)$ triangles can an equilateral triangle be divided into?

+10

Hungarian Algorithm: Sequence of Choices

+10

Collinear intersection points of diagonals in a regular heptagon

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