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Problems and Theorems in Classical Set Theory
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Peter Komjath, Vilmos Totik
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Computational Discrete Mathematics
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Helmut Alt
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Discrete Mathematics
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László Lovász, József Pelikán, K. Vesztergombi
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Putnam and Beyond
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Razvan Gelca, Titu Andreescu
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Problems in Analytic Number Theory
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U.S.R. Murty
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Notes on Introductory Combinatorics
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George Pólya, Robert E. Tarjan, Donald R. Woods
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Mathematical Olympiad Treasures
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Titu Andreescu
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Graph Theory Applications
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L.R. Foulds
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102 Combinatorial Problems
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Titu Andreescu, Zuming Feng
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Graph Theory
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Bela Bollobas
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