kinokijuf
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 Dec15 awarded Caucus Nov24 accepted How to write “there exists an infinite number of”? Nov23 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. Nov23 asked How to write “there exists an infinite number of”? Oct26 awarded Yearling Oct18 comment How to show that five points in ℝ³ are cospherical? @Mehrdad Then you can do it with two fives of them Oct18 revised How to show that five points in ℝ³ are cospherical? added 36 characters in body Oct18 asked How to show that five points in ℝ³ are cospherical? Sep26 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 Sep24 awarded Autobiographer Sep5 accepted Proof that if an algebraic integer is rational, it is integer? Sep5 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 Sep5 revised Proof that if an algebraic integer is rational, it is integer? added 32 characters in body; edited title Sep5 asked Proof that if an algebraic integer is rational, it is integer? Jul23 comment Help me solve my father's riddle and get my book back What's the book, if i can ask? Apr22 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. Apr22 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. Apr9 comment Visually deceptive “proofs” which are mathematically wrong @Kundor Ah. I’ve seen another fake proof that relied on this. Now i see this one is different. Apr8 comment Visually deceptive “proofs” which are mathematically wrong The p0rblem is that the bisector of BC and the bisector of A intersect outside the triangle — on the circumcircle, in fact. Mar30 comment Why would you expand a square wave in a Fourier series? @Nick Ën̈g̈l̈ïs̈ḧ ïs̈ n̈öẗ G̈ër̈m̈än̈, ïẗ d̈öës̈ n̈öẗ üs̈ë ẗḧë d̈ïäër̈ës̈ïs̈. (also, the Georgia font has hopelessly broken combining characters)