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Basic Relations in Polyhedra<br />

• First theorems on graph counting (Euler ( Euler) 1,2<br />

∑d ( dv dvdd<br />

) = 2 2ee (1)<br />

∑s ( sf sfss<br />

) = 2 2ee (2)<br />

where vv dd and ff ss denote vertices of degree d d and ss--sized sized faces,<br />

respectively.<br />

1. Euler, L. Solutio Problematis ad Geometriam Situs Pertinentis.<br />

Comment. Acad. Sci. I. Petropolitanae 1736, 8, , 128-140. 128 140.<br />

2. King, King,<br />

R. B., Applications of Graph Theory and Topology in<br />

Inorganic Cluster and Coordination Chemistry, Chemistry,<br />

CRC Press, 1993.<br />

16

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