#euclidpostulatesUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগSteem AllianceKorea • 한국 • KR • KOSTEEM CN/中文AVLE 일상Tron Fan ClubBeauty of CreativityComunidad LatinaSteem POD Team#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…