Question

Geometric proof of a trig identity on $\cos t \cos u\cos v$

score 233 · Answer 1 · 2026-04-11 22:08:28

233

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Geometric proof of a trig identity on $\cos t \cos u\cos v$

Published on 11 Apr 2026 - 22:08

score 92 · Answer 2 · 2017-11-24 20:34:05

92

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Determine whether $M = \{(x, y) \ | \ y < \sin(\frac{1}{x}) \ \text{and} \ x > 0 \} \subseteq (\mathbb{R}^2, d)$ is open or closed or neither

Published on 24 Nov 2017 - 20:34

score 392 · Answer 3 · 2026-04-10 10:40:44

392

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Existence of Frobenius Numbers without using Schur's Theorem

Published on 10 Apr 2026 - 10:40

score 245 · Answer 4 · 2017-11-27 17:20:18

245

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Geometric/trigonometric origin of a surprising algebraic identity?

Published on 27 Nov 2017 - 17:20

score 1.2k · Answer 5 · 2026-02-23 06:21:59

1.2k

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Proof of Miquel's six circle theorem

Published on 23 Feb 2026 - 6:21

score 47 · Answer 6 · 2026-04-12 14:55:28

47

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Define $H : I \times I \to \mathbb{C} \setminus \{0\}$ by $H(s, t) = e^{2\pi ist}$, show that $H$ is continuous

Published on 12 Apr 2026 - 14:55

score 492 · Answer 7 · 2026-03-28 22:28:04

492

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Uncountable closed set of reals biject with reals without replacement or choice

Published on 28 Mar 2026 - 22:28

score 2.9k · Answer 8 · 2026-03-28 23:20:01

2.9k

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Subsequences of a convergent sequence converge to the same limit as the original sequence

Published on 28 Mar 2026 - 23:20

score 26 · Answer 9 · 2026-04-11 04:27:54

26

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Is it a valid method of Proof?

Published on 11 Apr 2026 - 4:27

score 73 · Answer 10 · 2026-04-12 20:05:32

73

Views

Prove that every metric space such that every subset $A$ with $A\cap A'=\emptyset$ is countable is second countable

Published on 12 Apr 2026 - 20:05

score 35 · Answer 11 · 2026-04-11 21:31:24

35

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Proving a number has its n-root using intermediate value theorem (most general case)

Published on 11 Apr 2026 - 21:31

score 211 · Answer 12 · 2017-12-07 20:55:30

211

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Proof Verification: Order/Cardinality of a coset

Published on 07 Dec 2017 - 20:55

score 122 · Answer 13 · 2026-03-28 05:29:01

122

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Write the equation $\sin^2(x)-3/4$ in alternate form

Published on 28 Mar 2026 - 5:29

score 1k · Answer 14 · 2026-04-12 16:06:23

1k

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Question regarding a sequence formed by a infinite subset of R

Published on 12 Apr 2026 - 16:06

score 2.3k · Answer 15 · 2026-04-10 18:50:35

2.3k

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Ways to arrive at the existence of irrational numbers

Published on 10 Apr 2026 - 18:50

List Question

Geometric proof of a trig identity on $\cos t \cos u\cos v$

Determine whether $M = \{(x, y) \ | \ y < \sin(\frac{1}{x}) \ \text{and} \ x > 0 \} \subseteq (\mathbb{R}^2, d)$ is open or closed or neither

Existence of Frobenius Numbers without using Schur's Theorem

Geometric/trigonometric origin of a surprising algebraic identity?

Proof of Miquel's six circle theorem

Define $H : I \times I \to \mathbb{C} \setminus \{0\}$ by $H(s, t) = e^{2\pi ist}$, show that $H$ is continuous

Uncountable closed set of reals biject with reals without replacement or choice

Subsequences of a convergent sequence converge to the same limit as the original sequence

Is it a valid method of Proof?

Prove that every metric space such that every subset $A$ with $A\cap A'=\emptyset$ is countable is second countable

Proving a number has its n-root using intermediate value theorem (most general case)

Proof Verification: Order/Cardinality of a coset

Write the equation $\sin^2(x)-3/4$ in alternate form

Question regarding a sequence formed by a infinite subset of R

Ways to arrive at the existence of irrational numbers

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