#euclidpostulatesUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগKorea • 한국 • KR • KOSteem AllianceSTEEM CN/中文WORLD OF XPILARAVLE 일상Beauty of CreativityComunidad LatinaTron Fan Club#euclidpostulatesTrendingHotNewPayoutsMutedsamanfatma (25)in #euclidpostulates • 2 years agoWhy did Euclid prove his first four postulates? Why didn't he prove his fifth postulate (parallelism)?Euclid's first four postulates are often referred to as the "common notions," as they are basic assumptions that are…