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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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r/askscience
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How were railway bridges constructed in the 19th century?
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r/AskHistorians
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Question on relative wages in the early 1900s
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r/AskHistorians
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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
askscience
--
10
9
8
7
6
5
4
3
2
1
0
How were railway bridges constructed in the 19th century?
10
AskHistorians
--
10
9
8
7
6
5
4
3
2
1
0
Question on relative wages in the early 1900s
4
AskHistorians
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10
9
8
7
6
5
4
3
2
1
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