#euclidpostulatesUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesSteemitCryptoAcademyNewcomers' CommunitySteemit Feedbackআমার বাংলা ব্লগKorea • 한국 • KR • KOSteem AllianceSTEEM CN/中文AVLE 일상Beauty of CreativityTron Fan ClubComunidad LatinaSteem For Lifestyle#euclidpostulatesTrendingHotNewPayoutsMutedsamanfatma (25)in #euclidpostulates • 3 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…