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Circulwyrd

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math-history

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Questions (44)

Votes Activity Newest

14	History of the point at infinity?
8	equilateral triangle and trisection
7	Draw three congruent circles all touching one another, and a second set of three such circles, each touching also two of the first set.
6	Integrating left to right versus right to left.
5	Show $\sin(x+h) \cdot \cos x - \cos(x+h) \cdot \sin x = \sin h$ (without limits please - straight trigonometry only).

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Answers (36)

Votes Activity Newest

18	Examples of famous problems resolved easily
6	What is so special about triangles?!
3	I almost quit self-studying mathematics, but should I continue?
3	Could you explain why $\frac{d}{dx} e^x = e^x$ “intuitively”?
3	A post for the rejected — influential papers that had trouble getting published

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Tags (71)

23 math-history × 9	6 triangles × 4
21 big-list × 3	5 reference-request × 6
18 soft-question × 4	5 self-learning × 3
18 problem-solving	4 number-theory × 4
11 geometry × 24	4 book-recommendation × 3

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Bookmarks (13)

Votes Activity Newest Views Added

8	Show that three complex numbers $z_1, z_2, z_3$ are collinear iff $\operatorname{Im}(\overline{z_1}z_2+\overline{z_2}z_3+\overline{z_3}z_1) = 0$
6	A curious geometry problem: Find the $\angle OBC$
6	Let $\alpha$ and $\beta$ be any two distinct complex numbers,then $\|\alpha-\sqrt{\alpha^2-\beta^2}\|+\|\alpha+\sqrt{\alpha^2-\beta^2}\|=$
5	Euler line of triangle $ABC$ is parallel to side $BC$ $\implies$ $\tan B \tan C = 3$
5	non-abstract intuition for the equality $\int^{\infty}_{- \infty} \frac{\sin(x)}{x} = \sum^{\infty}_{- \infty} \frac{\sin(n)}{n} = \pi$

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Accounts (7)

	Mathematics	1,606 rep	11 silver badges23 bronze badges
	Latin Language	285 rep	1 silver badge5 bronze badges
	German Language	193 rep	1 silver badge7 bronze badges
	History of Science and Mathematics	101 rep	1 bronze badge
	Linguistics	101 rep	1 bronze badge

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Votes cast (268)

all time			by type			month		week
261	up		104	question		9		3
7	down		164	answer		9		3

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