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Kyūjitai form of 正八胞体: 5-cell; pentachoron
The 正五胞體 is a simple convex polytope in four dimensions, having five vertices.
5-cell; regular pentachoron
A 5-cell is a simple convex polytope in four dimensions.
Kyūjitai form of 正四面体: regular tetrahedron
This regular tetrahedron is composed of equilateral triangles on all sides.
regular icosahedron
He made a model of a regular icosahedron.
regular dodecahedron
He made a model of a regular dodecahedron.
(linear algebra) positive-semidefinite matrix
A positive-semidefinite matrix is one of the important concepts in linear algebra.
Kyūjitai form of 正八胞体: 16-cell; regular hexadecachoron
The 正十六胞體 is one of the regular polytopes in four dimensions.
600-cell; regular hexacosichoron
The 600-cell is one of the regular polytopes in four dimensions.
Kyūjitai form of 正六百胞体: 600-cell; regular hexacosichoron
The 正六百胞體 is one of the regular polytopes in four dimensions.
16-cell; regular hexadecachoron
The 16-cell is one of the convex regular polytopes in four dimensions.
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