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Hilbert’s Third Problem (A Story of Threes) Holy mathematics, Batman! Math at MIT, and why we need calculus to define volume.
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angles of one polyhedron α1, ..., αr and the dihedral angles of an ... α1 + ... + mr αr = n1 β1 + ... + ns βs + kπ
We will prove first that ... angles of one polyhedron α1, ..., αr, we can represent the first sum as