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 irisvanrooijcogsci.com
Combinatorial trolley problem - Iris van Rooij
| | 11011110.github.io
Planarizing matchings
7.2 parsecs away

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| | The drawing below shows the Petersen graph (blue vertices), with order-six dihedral symmetry rather than the order-10 symmetry that you're probably more used...
| | paperman.name
Charles Paperman
6.0 parsecs away

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| | quomodocumque.wordpress.com
Sphere packing, cap set, and the Turán problem are all the same thing | Quomodocumque
8.6 parsecs away

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| | OK, they are not really the same thing. But I got you reading, right? Here's the sense in which they're all the same thing. Let G be a group and H < G a subgroup. Let m > 1 be an integer. Write Orb_m for the set of orbits of G by simultaneous left multiplication...
| | bldavies.com
Decomposing matrices of pairwise minima - Ben Davies
29.7 parsecs away

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| Let \(A\) be the \(n\times n\) matrix with \({ij}^\text{th}\) entry \(A_{ij}=\min\{i,j\}\). From a previous post, we know \(A\) has a tridiagonal inverse \(A^{-1}\) with \({ij}^\text{th}\) entry1 $$\left[A^{-1}\right]_{ij}=\begin{cases} 2 & \text{if}\ i=j