Kamke, E.
Theory of sets
Dover, 1950
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Devlin, Keith
the Joy of sets : fundamentals of contemporary set theory ( with 11 illustrations) / Keith Devlin
Springer-Verlag, 1992
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James, I.M.
General topology and homotopy theory
Springer-Verlag , 1984
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Greever, John
Theory and examples of point-set topology
Brooks/Cole, 1969
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Choquet, Gustave
Topology
Academic Press, 1966
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