Titlebook: Combinatorial Enumeration of Groups, Graphs, and Chemical Compounds; G. Pólya,R. C. Read Textbook 1987 Springer-Verlag New York Inc. 1987

恶心

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Lipoprotein(A)

通情达理

比目鱼

Introduction,e number of certain trees., Some of his problems lend themselves to chemical interpretation: the number of trees in question is equal to the number of certain (theoretically possible) chemical compounds.

MARS

Groups,d balls discussed in Sec. 2 have to be replaced by more complex objects, which we will call figures; on the other hand, the special permutation group of the octahedron rotations will have to be replaced by a more general permutation group.

Insufficient

Graphs,xposition I provide more than the bare essentials. I begin by repeating some known definitions in graph theory. Some problems touched upon in the Introduction are going to be presented “officially” later on. I will adhere as much as possible to the terminology used by D. König in his elegant text..

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Chemical Compounds,al) formula. Conditions I and II in Sec. 29 become meaningful in chemical terms. Every edge terminating in two endpoints means that there are no free valences. The connectedness of a graph indicates that all atoms are tied together into a molecule. The number of edges ending in the same vertex corre

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Banister