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added top-level tag; https://meta.mathoverflow.net/questions/1457/why-are-mo-tags-formatted-as-they-are

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edited Jan 3, 2018 at 17:51

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co.combinatorics mg.metric-geometry discrete-geometry computational-geometry

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asked Jan 3, 2018 at 17:48

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How many triangulations of a regular octahedron are there, without introducing new vertices?

It is easy to find three triangulations, each consisting of four tetrahedra. Are there more?

discrete-geometry computational-geometry