Postulado das paralelas (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Postulado das paralelas" in Portuguese language version.

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books.google.com

Eric W. Weisstein (2003), CRC concise encyclopedia of mathematics, ISBN 1-58488-347-2 2nd ed. , p. 2147, The parallel postulate is equivalent to the Equidistance postulate, Playfair axiom, Proclus axiom, the Triangle postulate and the Pythagorean theorem.
Alexander R. Pruss (2006), The principle of sufficient reason: a reassessment, ISBN 0-521-85959-X, Cambridge University Press, p. 11, We could include...the parallel postulate and derive the Pythagorean theorem. Or we could instead make the Pythagorean theorem among the other axioms and derive the parallel postulate.

«Euclid's Fifth Postulate». www.cut-the-knot.org. Consultado em 14 de novembro de 2019
Bogomolny, Alexander. «Euclid's Fifth Postulate». Cut The Knot. Consultado em 30 Setembro 2011

Weisstein, Eric W. «Proclus' Axiom – MathWorld». Consultado em 5 de setembro de 2009