**Lecture 12:** Flexible polyhedra, Bellows Theorem; folding polygons into polyhedra,
gluings, convex polyhedral metrics, Aleksandrov's Theorem,
Sabitov's algorithm, ungluable polygons

**Page 3:** Aleksandrov's Theorem, proof sketch

These are rough, personal lecture notes handwritten by Erik Demaine used during lecture. Their primary purpose is for reading/review by students of the class.

Printable PostScript
(requires Level-2 PostScript)

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