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Sep
19
awarded  Notable Question
Sep
13
awarded  Notable Question
May
9
comment How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
@CutieKrait We defined $\sin$ by geometrical means.
Apr
2
accepted Why is it impossible to define multiplication in Presburger arithmetic?
Apr
2
comment Why is it impossible to define multiplication in Presburger arithmetic?
Ah, I see. Thank you for this answer.
Mar
31
comment Why is it impossible to define multiplication in Presburger arithmetic?
@MJD How are these axioms?
Mar
31
comment Why is it impossible to define multiplication in Presburger arithmetic?
@MJD Presburger arithmetic is an axiomatic system. People claim that it is impossible to define multiplication within this system. Why?
Mar
30
asked Why is it impossible to define multiplication in Presburger arithmetic?
Mar
4
awarded  Good Question
Jan
1
awarded  Yearling
Dec
12
awarded  Nice Question
Dec
5
awarded  Nice Answer
Oct
31
awarded  Taxonomist
Oct
23
awarded  Popular Question
Oct
18
asked Squaring modulo n — is there a systematic way to generate the fixpoints?
Sep
30
awarded  Popular Question
Sep
8
revised The inverse of the inscribed angle theorem
added 44 characters in body
Sep
8
comment The inverse of the inscribed angle theorem
I am sorry. I usually don't ignore the orientation of angles. I should've made that clear beforehand.
Sep
8
comment The inverse of the inscribed angle theorem
Nice and easy. Thank you!
Sep
8
accepted The inverse of the inscribed angle theorem