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location Poland
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visits member for 2 years, 9 months
seen 2 hours ago

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


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)
Feb
11
revised Why factorials above 85 contain zero's at the end.
75 kkkkkkkkkkkkkkkkk
Feb
11
suggested suggested edit on Why factorials above 85 contain zero's at the end.
Feb
9
comment True, false and meaningless statements in math.
@canaaerus I was asking what language nkoreli was writing in.
Feb
8
accepted A model of geometry with the negation of Pasch’s axiom?
Feb
8
comment True, false and meaningless statements in math.
@nkoreli what language is it? Google Translate does not recognise it.
Feb
5
asked A model of geometry with the negation of Pasch’s axiom?
Jan
30
comment Does ZFC have an intended interpretation?
Is the CH true or false in that model?
Jan
26
comment Is computer science a branch of mathematics?
@SteveJessop “Logic” is a branch of mathematics. “Both” and “Neither” are branches of philosophy.
Jan
3
comment Do we know if there exist true mathematical statements that can not be proven?
@PeterWebb If you add the negation of Goodstein’s theorem as an axiom, the resulting system will no longer have the natural numbers as a model.
Nov
14
comment How to tell $i$ from $-i$?
Of course, since we can arbitrarily define coordinates increasing, we’re back where we started.
Nov
14
awarded  Commentator
Nov
14
comment Can someone copyright/own a math problem?
Software patents are not recognised in civilised countries.
Nov
14
comment Is $\cos(90 - 2x) = \sin (2x)$?
cos(90-x) does not equal sin(x). cos(π/2-x) on the other hand, does.
Nov
13
suggested suggested edit on What is wrong with this proof: P = NP using polynomial solution for UHP