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500 examples and problems of applied differential equations / Ravi P. Agarwal, Simona Hodis, Donal O'Regan
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Unsolved problems in number theory / Richard K. Guy
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Theorems and problems in functional analysis / A.A. Kirillov, A.D. Gvishiani ; translated by Harold H. McFaden
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Unsolved problems in number theory / Richard K. Guy
: us,: gw. - New York : Springer-Verlag , c1981
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