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location Poland
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visits member for 3 years, 1 month
seen 2 days ago

Please do not “fix” lowercase i’s in my posts. It is a conscious decision on my part.


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.
Apr
9
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.
Apr
8
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.
Mar
30
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)