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2015
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Triangles are rigid in 2D space, pyramids are rigid in 3D space. Are there structures that are rigid in 4D or n-D) space?
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Triangles are rigid in 2D space, pyramids are rigid in 3D space. Are there structures that are rigid in 4D or n-D) space?
515
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10
9
8
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5
4
3
2
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