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Collapsing Walls Theorem

Igor Pak and Rom Pinchasi
The American Mathematical Monthly
Vol. 119, No. 2 (February 2012), pp. 156-160
DOI: 10.4169/amer.math.monthly.119.02.156
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Page Count: 5
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Collapsing Walls Theorem
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Abstract Let P ⊂ ℝ3 be a pyramid with the base a convex polygon Q. We show that when other faces are collapsed (rotated around the edges onto the plane spanned by Q), they cover the whole base Q.

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