User aman

7 votes

1 answer

2k views

I do not understand how the continuum hypothesis can be undecidable

asked Apr 2, 2019 at 7:11

6 votes

2 answers

351 views

$a+b \mid ab$ from CMO 1996

asked Mar 29, 2020 at 6:31

6 votes

0 answers

567 views

Find $f$ so that $f(f(n))=f(f(n+2)+2)=n$

asked Nov 10, 2020 at 10:45

5 votes

1 answer

2k views

Find $f:f(xf(x)+f(y))=f(x)^2+y$

asked Nov 18, 2020 at 7:20

5 votes

1 answer

244 views

Question about 12-tone musical scale and rational approximations

asked Dec 25, 2019 at 14:15

3 votes

0 answers

1k views

Given any 2n-1 integers, prove that there are always n of them which add up to a multiple of n

asked Apr 2, 2019 at 8:37

3 votes

3 answers

85 views

Why is the following an implication of the First Sylow Theorem?

asked Nov 22, 2023 at 1:52

2 votes

0 answers

144 views

Solution Verification: Olympiad number theory

asked Sep 10, 2021 at 3:54

2 votes

2 answers

197 views

Partitions in a generating function $(1-x)(1-x^2)(1-x^3)(1-x^4)...(1-x^{1000})$

asked Jul 1, 2019 at 13:35

2 votes

1 answer

323 views

Problem from the 1998 Hungarian Math Olympiad

asked Apr 25, 2020 at 12:24

2 votes

1 answer

197 views

If $x+y+z=1$, prove that $9xyz+1\ge 4(xy+yz+zx)$

asked Jun 26, 2020 at 12:08

1 vote

2 answers

102 views

Are there any non-trivial examples of this decimal-binary property

asked Mar 23, 2019 at 5:16

1 vote

1 answer

635 views

Number sequence modulo 10

asked Apr 7, 2021 at 15:05

1 vote

0 answers

286 views

Lorentz Transformation Geometric Interpretation

asked May 3, 2021 at 10:26

1 vote

0 answers

31 views

Cross product integral along an elipse

asked Jun 10, 2021 at 8:20

1 vote

0 answers

572 views

Proof of binomial theorem for non-integers

asked May 2, 2020 at 5:58

1 vote

1 answer

87 views

Functions which satisfy $f(m^2+n^2)=f(m)^2+f(n)^2$ [duplicate]

asked Nov 9, 2020 at 12:17

0 votes

1 answer

457 views

Percentage of Earth surface above a latitude line

asked Oct 24, 2021 at 5:15

0 votes

1 answer

71 views

Confusion about connectedness

asked Jan 16 at 0:40

0 votes

1 answer

41 views

Is this proof of inequality relating to triangles correct?

asked Jun 11, 2020 at 11:23

0 votes

1 answer

104 views

Help in proving this inequality

asked Jun 12, 2020 at 4:56

0 votes

1 answer

254 views

Angle Chasing in Geometry [duplicate]

asked Sep 2, 2019 at 10:46

0 votes

1 answer

52 views

Finding $n$ such that in a regular $n$-gon $A_1A_2\ldots A_n$ we have $\frac1{A_1A_2}=\frac1{A_1A_3}+\frac1{A_1A_4}$ [duplicate]

asked Oct 23, 2020 at 11:45

Stack Exchange Network

23 Questions

I do not understand how the continuum hypothesis can be undecidable

$a+b \mid ab$ from CMO 1996

Find $f$ so that $f(f(n))=f(f(n+2)+2)=n$

Find $f:f(xf(x)+f(y))=f(x)^2+y$

Question about 12-tone musical scale and rational approximations

Given any 2n-1 integers, prove that there are always n of them which add up to a multiple of n

Why is the following an implication of the First Sylow Theorem?

Solution Verification: Olympiad number theory

Partitions in a generating function $(1-x)(1-x^2)(1-x^3)(1-x^4)...(1-x^{1000})$

Problem from the 1998 Hungarian Math Olympiad

If $x+y+z=1$, prove that $9xyz+1\ge 4(xy+yz+zx)$

Are there any non-trivial examples of this decimal-binary property

Number sequence modulo 10

Lorentz Transformation Geometric Interpretation

Cross product integral along an elipse

Proof of binomial theorem for non-integers

Functions which satisfy $f(m^2+n^2)=f(m)^2+f(n)^2$ [duplicate]

Percentage of Earth surface above a latitude line

Confusion about connectedness

Is this proof of inequality relating to triangles correct?

Help in proving this inequality

Angle Chasing in Geometry [duplicate]

Finding $n$ such that in a regular $n$-gon $A_1A_2\ldots A_n$ we have $\frac1{A_1A_2}=\frac1{A_1A_3}+\frac1{A_1A_4}$ [duplicate]