The New Encyclopaedia Britannica: Suppl, Volume 16Encyclopaedia Britannica, 1997 |
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Page 617
... isomorphic graphs and a tree . OW . OWS of pairs of vertices , and each pair is either an edge or not an edge . Cayley in 1889 showed that the number of labelled trees with u vertices is v - 2 . The number of unlabelled graphs with u ...
... isomorphic graphs and a tree . OW . OWS of pairs of vertices , and each pair is either an edge or not an edge . Cayley in 1889 showed that the number of labelled trees with u vertices is v - 2 . The number of unlabelled graphs with u ...
Page 619
... isomorphic , or of the same combinatorial type , provided there exists a one- to - one correspondence between their faces , such that two faces of the first polytope meet if and only if the corre- sponding faces of the second meet . The ...
... isomorphic , or of the same combinatorial type , provided there exists a one- to - one correspondence between their faces , such that two faces of the first polytope meet if and only if the corre- sponding faces of the second meet . The ...
Page 620
... isomorphic , the corre- spondence being indicated by the letters at the vertices . To classify the convex polygons by their combinatorial types , it is sufficient to determine the number of vertices v ; for each v 3 , all polygons with ...
... isomorphic , the corre- spondence being indicated by the letters at the vertices . To classify the convex polygons by their combinatorial types , it is sufficient to determine the number of vertices v ; for each v 3 , all polygons with ...
Contents
CHINA | 36 |
CHINESE LITERATURE | 231 |
CHORDATES CHRISTIANITY | 251 |
Copyright | |
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