Proofs of the Euclidean [parallel] postulate can be developed to such an extent that apparently a mere trifle remains. But a careful analysis shows that in this seeming trifle lies the crux of the matter; usually it contains either the… — Johann Heinrich Lambert Copy Share Image
![“Proofs of the Euclidean [parallel] postulate can be developed to such an extent that apparently a mere trifle remains. But a careful analysis shows that in this seeming trifle lies the crux of the matter; usually it contains either the proposition that is being proved or a postulate equivalent to…” quote by Johann Heinrich Lambert](https://sms4smile.com/quotes/img-quotes/877/johann-heinrich-lambert-52135_analysis_proofs-of-the-euclidean-parallel-postula_2760071.jpg)