By Winter P. A.

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**Extra resources for 2-3 graphs which have Vizings adjacency property**

**Sample text**

6 and for non-regular graphs. 4, on the representation of endomorphisms by transformation matrices. Since square matrices have determinants and permanents, these concepts can be applied to graphs. So the value of the determinant can be related to the combinatorial structure of the graph. Note that the permanent of (the adjacency matrix of) a digraph counts the number of cycle covers of the digraph; references to this can be found on the internet. 3 we will study the spectra of line graphs. Several other questions concerning eigenvalues and the automorphism group are discussed in Chapter 8.

Rival, Retract rigid Cartesian products of graphs, Discrete Math. 70 (1988) 169–184. e. only for endotypes smaller than 16; so in our situation only endotype 6 remains. The statement concerning the smallest examples follows by inspection. In the following table we use the union and the multiple union of graphs in a naive way. A formal deﬁnition (as coproduct) will follow in Chapter 3. 16. Bipartite graphs are exactly of the following endotypes, where the graphs or their common structures are given where possible.

G/ which has the eigenvalues as its diagonal elements. G/ and so,Pin particular, for Pnthe coefﬁcient of t n Vieta’s Theorem is iD1 i . Thus iD1 i D 0. G/2 / D sum of the vertex degrees, P which is always equal to 2 jEGj. G/2 /. 7. 6. In line with the preceding theorem, we can interpret the coefﬁcients of the characteristic polynomial in terms of the number of cycles of the graph. In principle this can be done for all coefﬁcients, but here we present the result only for four coefﬁcients and prove it for three of them; cf.

### 2-3 graphs which have Vizings adjacency property by Winter P. A.

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