Question

If $a \cdot a = 1$ then $a = 1$ or $a = -1$

score 1.1k · Answer 1 · 2026-04-02 17:42:56

1.1k

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If $a \cdot a = 1$ then $a = 1$ or $a = -1$

Published on 02 Apr 2026 - 17:42

score 67 · Answer 2 · 2026-03-26 20:16:47

67

Views

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

Published on 26 Mar 2026 - 20:16

score 67 · Answer 3 · 2026-03-25 09:29:49

67

Views

Equations of the diagonals of a quadrilateral (convex, concave or crossed) from the equations of its sides, without calculating its vertices

Published on 25 Mar 2026 - 9:29

score 64 · Answer 4 · 2026-03-25 11:26:03

64

Views

Uniqueness of a General IVP

Published on 25 Mar 2026 - 11:26

score 2.1k · Answer 5 · 2026-03-25 17:21:44

2.1k

Views

Prove that if in a tetrahedron if two pairs of opposite edges are perpendicular then the third pair is also perpendicular.

Published on 25 Mar 2026 - 17:21

score 88 · Answer 6 · 2018-09-21 09:14:33

88

Views

Suppose that $Y \subseteq X$ and that $f:X \to Y$ is injective. Then there is a bijection from $X$ to $Y$

Published on 21 Sep 2018 - 9:14

score 58 · Answer 7 · 2026-03-28 05:39:07

58

Views

Understanding Gaps in concept of Radius of Convergence of Power Series

Published on 28 Mar 2026 - 5:39

score 685 · Answer 8 · 2026-03-28 07:59:29

685

Views

Proof that each element of finite arbitrary group belongs to unique conjugacy class - question on step which takes inverse of a product

Published on 28 Mar 2026 - 7:59

score 420 · Answer 9 · 2026-04-08 21:40:08

420

Views

A group of cardinality $4$ is abelian

Published on 08 Apr 2026 - 21:40

score 2.6k · Answer 10 · 2026-03-26 20:16:50

2.6k

Views

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

Published on 26 Mar 2026 - 20:16

score 772 · Answer 11 · 2026-04-09 04:03:01

772

Views

Proof that $H \cap K$ is a group if $H$ and $K$ are subgroups of $G$

Published on 09 Apr 2026 - 4:03

score 22 · Answer 12 · 2018-09-22 00:24:27

22

Views

This residues calculation is correct?

Published on 22 Sep 2018 - 0:24

score 239 · Answer 13 · 2026-03-26 07:35:39

239

Views

Bijection between ideals of a poset and order-preserving maps from the poset to $\{0,1\}$.

Published on 26 Mar 2026 - 7:35

score 96 · Answer 14 · 2018-09-22 00:41:04

96

Views

Consider a monotone nondecreasing function $f$ on a closed interval $[a,b].$ Show that it...

Published on 22 Sep 2018 - 0:41

score 999 · Answer 15 · 2018-09-22 03:31:40

999

Views

Orthogonal basis of specific span in the continuous function space

Published on 22 Sep 2018 - 3:31

List Question

If $a \cdot a = 1$ then $a = 1$ or $a = -1$

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

Equations of the diagonals of a quadrilateral (convex, concave or crossed) from the equations of its sides, without calculating its vertices

Uniqueness of a General IVP

Prove that if in a tetrahedron if two pairs of opposite edges are perpendicular then the third pair is also perpendicular.

Suppose that $Y \subseteq X$ and that $f:X \to Y$ is injective. Then there is a bijection from $X$ to $Y$

Understanding Gaps in concept of Radius of Convergence of Power Series

Proof that each element of finite arbitrary group belongs to unique conjugacy class - question on step which takes inverse of a product

A group of cardinality $4$ is abelian

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

Proof that $H \cap K$ is a group if $H$ and $K$ are subgroups of $G$

This residues calculation is correct?

Bijection between ideals of a poset and order-preserving maps from the poset to $\{0,1\}$.

Consider a monotone nondecreasing function $f$ on a closed interval $[a,b].$ Show that it...

Orthogonal basis of specific span in the continuous function space

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