David Tománek:
Guide through the Nanocarbon Jungle:
Buckyballs, Nanotubes, Graphene, and Beyond
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Euler's theorem
Wikipedia
:
Euler characteristic
χ. Euler's theorem for convex polyhedra such as fullerenes states that χ=2. Euler's theorem is equivalent to
Descartes' lost theorem
.
David Eppstein, Theory Group,
ICS, UC Irvine --
Geometry Junkyard
:
Twenty proofs of Euler's formula
.