Ulrich Knauer & Kolja Knauer 
Algebraic Graph Theory [PDF ebook] 
Morphisms, Monoids and Matrices

Graph models are extremely useful for a large number of applications as they play an important role as structuring tools. They allow to model net structures – like roads, computers, telephones, social networks – instances of abstract data structures – like lists, stacks, trees – and functional or object oriented programming. The focus of this highly self-contained book is on homomorphisms and endomorphisms, matrices and eigenvalues.

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