How to derive elliptic integral of the first kind from $\int_{-\pi}^{\pi}\frac{1}{\sqrt{(\eta^{2}/2 - 3/2 -\cos 2\theta)^2 -4 \cos^2\theta}}\ d\theta$

score 21 · Answer 11 · 2026-02-23 00:49:32

21

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Is 3-dimensional permutohedral lattice $A^\ast_3$ equivalent to Body-Centered Cubic (BCC) lattice?

Published on 23 Feb 2026 - 0:49

score 94 · Answer 12 · 2026-02-23 00:50:45

94

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Are there any 2D aperiodic tilings that are the projections from a 3D lattice?

Published on 23 Feb 2026 - 0:50

score 103 · Answer 13 · 2026-02-23 00:49:22

103

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"Explaining" a coincidental connection between Pascal's triangle and symmetries of lattices

Published on 23 Feb 2026 - 0:49

score 189 · Answer 14 · 2026-03-22 10:03:17

189

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Definition of a lattice in an affine space

Published on 22 Mar 2026 - 10:03

score 4.9k · Answer 15 · 2026-04-06 01:06:17

4.9k

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What is a "convex" polyhedron?

Published on 06 Apr 2026 - 1:06

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How to derive elliptic integral of the first kind from $\int_{-\pi}^{\pi}\frac{1}{\sqrt{(\eta^{2}/2 - 3/2 -\cos 2\theta)^2 -4 \cos^2\theta}}\ d\theta$

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