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I am a beginner in this craft. Do you know where can I download a good book about basics of discrete mathematics?

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What are your prerequisites? What do you need to learn? – Henning Makholm Jul 6 '12 at 23:12
Just in case someone would consider vote-duplicate, kindly note that OP asks for a downloadable book. – user2468 Jul 6 '12 at 23:29
Do you have access to a library? (somewhat off the downloadable topic) – mixedmath Jul 6 '12 at 23:38

László Lovász & Kati Vesztergombi, Discrete Mathematics, Lecture Notes, Yale University, Spring 1999, is available as a .ps file here and as a PDF here.

Edward A. Bender & S. Gill Williamson, Foundations of Combinatorics with Applications, is available in both formats here.

Both have a strong emphasis on combinatorics, and both do a significant amount of graph theory. The Bender & Williamson is a bit more computer-science oriented and covers in greater depth some of the topics that they have in common; the Lovász & Vesztergombi covers some elementary number theory.

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thank you!!!!!! – Mister PHP Jul 7 '12 at 22:36

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