Question

Inversion in a sphere preserves circles (proof)

score 340 · Answer 1 · 2026-03-23 09:17:17

340

Views

Inversion in a sphere preserves circles (proof)

Published on 23 Mar 2026 - 9:17

score 123 · Answer 2 · 2026-03-25 20:42:27

123

Views

An elementary proof of $\pi_1(S^n) =1$ using this general theorem

Published on 25 Mar 2026 - 20:42

score 161 · Answer 3 · 2026-03-25 03:22:56

161

Views

Groups are cocomplete by adjoint functor theorem without explicit use of free products

Published on 25 Mar 2026 - 3:22

score 23 · Answer 4 · 2026-03-25 20:35:03

23

Views

Intuition about combining half-open intervals into inequality with absolute value?

Published on 25 Mar 2026 - 20:35

score 81 · Answer 5 · 2018-09-13 19:16:50

81

Views

A second approach to a proof of the External Angle Theorem for triangles

Published on 13 Sep 2018 - 19:16

score 408 · Answer 6 · 2018-09-14 12:20:05

408

Views

The number of permutations of $\mathbb{N}$

Published on 14 Sep 2018 - 12:20

score 136 · Answer 7 · 2018-09-14 18:04:16

136

Views

Find condition for $\alpha + \beta+ \gamma=\alpha . \beta. \gamma$

Published on 14 Sep 2018 - 18:04

score 42 · Answer 8 · 2018-09-16 14:13:59

42

Views

Another proof for $\lim\limits_{n \to \infty}n^{\frac{1}{n}}=1(n=1,2,\cdots)$.

Published on 16 Sep 2018 - 14:13

score 39 · Answer 9 · 2018-09-18 11:05:19

39

Views

Another proof for impossibility of covering $\mathbb{R}^{n}$ with a set of varieties of cardinality less than $2^{\aleph_0}$

Published on 18 Sep 2018 - 11:05

score 641 · Answer 10 · 2026-03-26 11:08:42

641

Views

If $\#(S)<\#(\Bbb N)$, then prove that $S$ is finite, without using the Axiom of Choice.

Published on 26 Mar 2026 - 11:08

score 66 · Answer 11 · 2018-09-21 01:43:59

66

Views

How to find the minimum of $x^2 + \frac{25}{x^2} + 3$ with proof based mathematics (no calculus)?

Published on 21 Sep 2018 - 1:43

score 1.5k · Answer 12 · 2018-09-21 13:45:06

1.5k

Views

How many triplet primes of the form $p, p+2, p+4$ are there? Prove your conjecture.

Published on 21 Sep 2018 - 13:45

score 2.6k · Answer 13 · 2018-09-21 15:58:18

2.6k

Views

Proving that a line segment joining the midpoints of two sides of a triangle equals half of third side.

Published on 21 Sep 2018 - 15:58

score 251 · Answer 14 · 2026-03-25 01:24:15

251

Views

Determine where this function is continuous - floor function

Published on 25 Mar 2026 - 1:24

score 74 · Answer 15 · 2018-09-26 11:36:11

74

Views

Is $\mathbb{Z} \times \mathbb{R} \subseteq \mathbb{R} \times \mathbb{Z}$ true?

Published on 26 Sep 2018 - 11:36

List Question

Inversion in a sphere preserves circles (proof)

An elementary proof of $\pi_1(S^n) =1$ using this general theorem

Groups are cocomplete by adjoint functor theorem without explicit use of free products

Intuition about combining half-open intervals into inequality with absolute value?

A second approach to a proof of the External Angle Theorem for triangles

The number of permutations of $\mathbb{N}$

Find condition for $\alpha + \beta+ \gamma=\alpha . \beta. \gamma$

Another proof for $\lim\limits_{n \to \infty}n^{\frac{1}{n}}=1(n=1,2,\cdots)$.

Another proof for impossibility of covering $\mathbb{R}^{n}$ with a set of varieties of cardinality less than $2^{\aleph_0}$

If $\#(S)<\#(\Bbb N)$, then prove that $S$ is finite, without using the Axiom of Choice.

How to find the minimum of $x^2 + \frac{25}{x^2} + 3$ with proof based mathematics (no calculus)?

How many triplet primes of the form $p, p+2, p+4$ are there? Prove your conjecture.

Proving that a line segment joining the midpoints of two sides of a triangle equals half of third side.

Determine where this function is continuous - floor function

Is $\mathbb{Z} \times \mathbb{R} \subseteq \mathbb{R} \times \mathbb{Z}$ true?

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