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# Questions

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### How are Modal Logic and Graph Theory related?

mar 14 at 1:35 rzach 211

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483
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### Reference Request: Non-Standard Models of PA

mar 3 12 at 0:05 Benedict Eastaugh 1514

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### Surface Eversions: Generalizing from Sphere and Torus Eversions

may 12 12 at 2:24 Agol 23.9k13384

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### Kissing Number of Spheres in Non-Euclidean Geometry

mar 1 at 10:34 Will Jagy 12.5k12645

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### How many models of Peano arithmetic are isomorphic to the standard model and how many models of Peano arithmetic are non-standard?

mar 24 12 at 21:16 Joel David Hamkins 75.3k7187343

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191
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### Under what conditions does $\mathcal{M} \vDash \mathsf{PA}$ and $\mathcal{K} \vDash \mathsf{PA}$ such that $\mathcal{M} \ncong \mathcal{K}$?

mar 11 12 at 22:06 Joel David Hamkins 75.3k7187343

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221
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### Finding the order of a flip graph and how it relates to all possible triangulations of a graph

jan 4 12 at 0:49 Joseph O'Rourke 43.3k149214

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### Methods for generating metrics and minimizing variational dynamics of particles (masses or charges) on n-dimensional smooth manifolds

jan 17 12 at 20:35 Samuel Reid 56129

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184
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### Generalizing the circle packing theorem to 3-dimensions

may 7 12 at 18:56 Igor Rivin 31.2k33771

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