Euclid's axiom of parallels parallel postulate English parallel postulate Euclid's parallel postulate the fifth postulate of Euclidean geometry non-Euclidean geometry fifth postulate English parallel postulate English Parallel Postulate Wikipedia Parallel Postulate article parallel postulate fifth Euclid's postulate English Wikipedia Parallel Postulate article http://en.wikipedia.org/wiki/Parallel_postulate axiom of parallels parallel axiom Euclid's Parallel Postulate fifth Euclid's postulate parallel postulate Euclid's Parallel Postulate logical equivalents parallel postulate Wikipedia Parallel Postulate article English Euclid's Parallel Postulate Euclid's parallel postulate fifth Euclid's postulate fifth Euclid's postulate axiom of parallels Euclid's axiom English English English parallel axiom Euclid's axiom of parallels English parallel axiom Euclid's Parallel Postulate parallel postulate English The parallel line postulate. 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http://en.wikipedia.org/wiki/Parallel_postulate Euclid's Parallel Postulate parallel postulate fifth Euclid's postulate fifth Euclid's postulate parallel postulate axiom of parallels parallel postulate parallel postulate parallel postulate fifth Euclid's postulate English English Euclid's fifth postulate English parallel postulate English Parallel Postulate English Euclid's http://en.wikipedia.org/wiki/Parallel_postulate English parallel postulate en.wikipedia.org/wiki/… Euclid's fifth postulate parallel axiom Euclid's Euclid's Parallel Postulate English Wikipedia Parallel Postulate article en.wikipedia.org/wiki/… Parallel postulate English parallel postulate English fifth Euclid's postulate fifth postulate n-dimensional postulate of photosynthesis Euclid's Parallel Postulate parallel postulate Wikipedia parallel postulate Fifth Postulate parallel postulate Euclid's fifth postulate parallel postulate English statement http://en.wikipedia.org/wiki/Parallel_postulate English Parallel 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