Proyección (teoría de conjuntos) (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Proyección (teoría de conjuntos)" in Spanish language version.

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7^th place

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Halmos, P. R. (1960), Naive Set Theory, Undergraduate Texts in Mathematics, Springer, p. 32, ISBN 9780387900926 ..
Brown, Arlen; Pearcy, Carl M. (1995), An Introduction to Analysis, Graduate Texts in Mathematics 154, Springer, p. 8, ISBN 9780387943695 ..
Jech, Thomas (2003), Set Theory: The Third Millennium Edition, Springer Monographs in Mathematics, Springer, p. 34, ISBN 9783540440857 ..