Question

Given $A$ is a set of cardinality $c$ and $p, q$ and $r$ are distinct members of $A$

score 68 · Answer 1 · 2019-03-27 13:42:51

68

Views

Given $A$ is a set of cardinality $c$ and $p, q$ and $r$ are distinct members of $A$

Published on 27 Mar 2019 - 13:42

score 34 · Answer 2 · 2026-03-26 17:36:21

34

Views

$\det S = S\vec{u}\cdot(S\vec{v}\times S\vec{w})/ \vec{u}\cdot(\vec{v}\times \vec{w})$

Published on 26 Mar 2026 - 17:36

score 74 · Answer 3 · 2026-03-27 04:21:51

74

Views

$X$ is defined as the collection of sets $X = \{X_i: i \in [0, 1] \}$ where each set has cardinality $c$

Published on 27 Mar 2026 - 4:21

score 169 · Answer 4 · 2019-04-01 11:39:57

169

Views

Counterexample for the following statement

Published on 01 Apr 2019 - 11:39

score 177 · Answer 5 · 2019-04-02 10:56:15

177

Views

If $\int_a^b f\, d\alpha $ exists for all continuous $f$ then $\alpha$ is of bounded variation

Published on 02 Apr 2019 - 10:56

score 39 · Answer 6 · 2019-04-02 16:57:23

39

Views

Convergent sequence of points

Published on 02 Apr 2019 - 16:57

score 598 · Answer 7 · 2019-04-04 00:12:51

598

Views

Induction proof of $\sum_{i=0}^{n}(5i+3) = \frac{n(5n+11)}{2}+3$ for every natural $n$

Published on 04 Apr 2019 - 0:12

score 161 · Answer 8 · 2019-04-05 08:36:11

161

Views

Prove that the four points are concyclic if they are harmonically related w.r.t. the midpoint of connecting line segment.

Published on 05 Apr 2019 - 8:36

score 40 · Answer 9 · 2019-04-07 15:29:17

40

Views

combinatorics problem: ordering people from small to large. Is my solution correct?

Published on 07 Apr 2019 - 15:29

score 719 · Answer 10 · 2019-04-07 20:21:59

719

Views

Amount of odd numbers between $4000$ and $5000$ with distinct digits and ranking of $4579$ in this sequence

Published on 07 Apr 2019 - 20:21

score 2.5k · Answer 11 · 2019-04-08 03:04:27

2.5k

Views

Let be $G$ a group and $a,b \in G$. Prove that $ (ab) ^{-1} = b^{-1}a^{-1}$

Published on 08 Apr 2019 - 3:04

score 523 · Answer 12 · 2026-03-26 12:32:13

523

Views

Lagrange multiplier without implicit function theorem

Published on 26 Mar 2026 - 12:32

score 81 · Answer 13 · 2019-04-08 19:42:18

81

Views

A convergent regrouping of a series which tends to 0 implies convergence

Published on 08 Apr 2019 - 19:42

score 127 · Answer 14 · 2026-03-26 23:11:48

127

Views

prove this inequality with $x^3+y^3+z^3$

Published on 26 Mar 2026 - 23:11

score 74 · Answer 15 · 2026-03-26 12:42:11

74

Views

Fibonacci Challenge Proof

Published on 26 Mar 2026 - 12:42

List Question

Given $A$ is a set of cardinality $c$ and $p, q$ and $r$ are distinct members of $A$

$\det S = S\vec{u}\cdot(S\vec{v}\times S\vec{w})/ \vec{u}\cdot(\vec{v}\times \vec{w})$

$X$ is defined as the collection of sets $X = \{X_i: i \in [0, 1] \}$ where each set has cardinality $c$

Counterexample for the following statement

If $\int_a^b f\, d\alpha $ exists for all continuous $f$ then $\alpha$ is of bounded variation

Convergent sequence of points

Induction proof of $\sum_{i=0}^{n}(5i+3) = \frac{n(5n+11)}{2}+3$ for every natural $n$

Prove that the four points are concyclic if they are harmonically related w.r.t. the midpoint of connecting line segment.

combinatorics problem: ordering people from small to large. Is my solution correct?

Amount of odd numbers between $4000$ and $5000$ with distinct digits and ranking of $4579$ in this sequence

Let be $G$ a group and $a,b \in G$. Prove that $ (ab) ^{-1} = b^{-1}a^{-1}$

Lagrange multiplier without implicit function theorem

A convergent regrouping of a series which tends to 0 implies convergence

prove this inequality with $x^3+y^3+z^3$

Fibonacci Challenge Proof

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