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 Nov 14 awarded Curious Nov 13 accepted Linear independence and ∞-dimensioned vector spaces Nov 13 asked Linear independence and ∞-dimensioned vector spaces Dec 15 awarded Caucus Nov 24 accepted How to write “there exists an infinite number of”? Nov 23 comment How to write “there exists an infinite number of”? @user48481MirkoSwirko Thanks! Searching the internet for "exists infty" actually turned up examples of it being used, and it has the benefit of being rather obvious. Nov 23 asked How to write “there exists an infinite number of”? Oct 26 awarded Yearling Oct 18 comment How to show that five points in ℝ³ are cospherical? @Mehrdad Then you can do it with two fives of them Oct 18 revised How to show that five points in ℝ³ are cospherical? added 36 characters in body Oct 18 asked How to show that five points in ℝ³ are cospherical? Sep 26 comment Proof that if an algebraic integer is rational, it is integer? @Rhubbarb I only knew the convention that 𝔸 is algebraic integers and ℚ̅ is the algebraic numbers Sep 24 awarded Autobiographer Sep 5 accepted Proof that if an algebraic integer is rational, it is integer? Sep 5 comment Proof that if an algebraic integer is rational, it is integer? @RebeccaJ.Stones It appears to be an invented name, since i can’t find any outside sources, but thanks. This is sufficient for me Sep 5 revised Proof that if an algebraic integer is rational, it is integer? added 32 characters in body; edited title Sep 5 asked Proof that if an algebraic integer is rational, it is integer? Jul 23 comment Help me solve my father's riddle and get my book back What's the book, if i can ask? Apr 22 comment If there are obvious things, why should we prove them? He did not have an incorrect proof, but used it implicitly without defining it as an axiom. Apr 22 comment If there are obvious things, why should we prove them? A better example, also from geometry, would be Pasch’s axiom. It is entirely non-obvious that it is independent — and was thought to be a theorem by Euclid.