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...The project gutenberg ebook of elements non euclidean geometry by julian lowell coolidge this is for use anyone anywhere at no cost and with almost restrictions whatsoever you may copy it give away or re under terms license included online www org title author release date august language english character set encoding iso start produced joshua hutchinson david starner keith edkins distributed proofreading team http pgdp net theelementsof euclideangeometry ph d assistant professor mathematics in harvard university oxford attheclarendonpress preface heroic age passed long since days when lobatchewsky timidly referred to his system as an imaginary new subject appeared a dangerous lapse from orthodox doctrine euclid attempt prove parallel axiom means other usual assumptions now seldom undertaken those who do undertake are considered class circle squarers searchers perpetual motion sad products creative activity modern science all changes there both rejoicing regret satisfaction writer on ...