#euclidpostulatesUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemit FeedbackSteemitCryptoAcademyআমার বাংলা ব্লগSteem AllianceKorea • 한국 • KR • KOBeauty of CreativitySTEEM CN/中文Tron Fan ClubSteem POD TeamComunidad LatinaAVLE 일상#euclidpostulatesTrendingHotNewPayoutsMutedsamanfatma (25)in #euclidpostulates • 4 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…