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ideal polyhedron

From Wiktionary, the free dictionary

English

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 ideal polyhedron on Wikipedia
An ideal octahedron.

Noun

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ideal polyhedron (plural ideal polyhedrons or ideal polyhedra)

  1. In hyperbolic geometry, a polyhedron whose vertices are all ideal; i.e. points at infinity, rather than real. Its surface is topologically equivalent to a punctured sphere.