Found 2 3D-models for “mathmatical” across many websites

#numberphile#mathmatical#hole#topology#geodetic#shape#math#polyhedron#isocahedron#model
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Hole in a hole in a hole

Hole in a hole in a hole

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Icosahedron made from 5/8 (16mm) PVC electrical pipe

Icosahedron made from 5/8 (16mm) PVC electrical pipe

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