Question

D-numerable graphs exercise. A question about a proof of a graph theory, coloring exercise.

score 34 · Answer 1 · 2026-04-12 02:26:55

34

Views

D-numerable graphs exercise. A question about a proof of a graph theory, coloring exercise.

Published on 12 Apr 2026 - 2:26

score 288 · Answer 2 · 2026-04-08 21:51:40

288

Views

Issue with Matrix Multiplication using the Formal Definition

Published on 08 Apr 2026 - 21:51

score 80 · Answer 3 · 2026-04-15 13:50:53

80

Views

Prove that $\sum_{j=1}^{n} \mathbb{P}(I_j) \geq \mathbb{P}(I)$, when $\bigcup_{j=1}^n I_j \supseteq I$.

Published on 15 Apr 2026 - 13:50

score 305 · Answer 4 · 2026-04-12 18:35:06

305

Views

Sums of cubes of two complex matrices are closed under matrix multiplication

Published on 12 Apr 2026 - 18:35

score 48 · Answer 5 · 2026-04-15 21:13:33

48

Views

Is it necessary to explicitly state that $\lnot (q \notin X)$ is equivalent to $q \in X$ when writing a proof?

Published on 15 Apr 2026 - 21:13

score 557 · Answer 6 · 2026-04-16 07:26:57

557

Views

Prove a DAG can be obtained by an undirected graph's longest cycle

Published on 16 Apr 2026 - 7:26

score 60 · Answer 7 · 2026-04-11 08:43:48

60

Views

Attempt to proof following statement (kernel and image of a matrix)

Published on 11 Apr 2026 - 8:43

score 739 · Answer 8 · 2026-04-14 20:59:03

739

Views

Fibonacci gcd proof

Published on 14 Apr 2026 - 20:59

score 155 · Answer 9 · 2026-04-15 19:30:58

155

Views

$E[E[X\mid Y] =$ $\sum_{y\mid P(Y=y>0)}E[X\mid Y=y] \cdot P(Y =y)$

Published on 15 Apr 2026 - 19:30

score 83 · Answer 10 · 2026-04-14 08:07:42

83

Views

Proving that $0$ is an eigenvalue of this transformation

Published on 14 Apr 2026 - 8:07

score 380 · Answer 11 · 2026-04-15 13:02:09

380

Views

Where can I find the proofs of the properties of exponentiation when powers are members of ℕ, ℤ, ℚ, ℙ, and ℝ?

Published on 15 Apr 2026 - 13:02

score 1k · Answer 12 · 2026-04-15 21:34:39

1k

Views

Show $p(x_n)$ $\rightarrow$ $p(x)$ for a convergent sequence $\{ x_n \}$

Published on 15 Apr 2026 - 21:34

score 103 · Answer 13 · 2026-04-13 06:03:35

103

Views

Exercise about subspaces of $\mathbb{R}^n$

Published on 13 Apr 2026 - 6:03

score 753 · Answer 14 · 2026-04-14 16:46:56

753

Views

A subset $A\subset \mathbb R^n$ is compact iff every nested sequence of relatively closed, non-empty subsets of $A$ has non-empty intersection.

Published on 14 Apr 2026 - 16:46

score 215 · Answer 15 · 2026-04-13 15:22:56

215

Views

Sequential compactness and boundedness

Published on 13 Apr 2026 - 15:22

List Question

D-numerable graphs exercise. A question about a proof of a graph theory, coloring exercise.

Issue with Matrix Multiplication using the Formal Definition

Prove that $\sum_{j=1}^{n} \mathbb{P}(I_j) \geq \mathbb{P}(I)$, when $\bigcup_{j=1}^n I_j \supseteq I$.

Sums of cubes of two complex matrices are closed under matrix multiplication

Is it necessary to explicitly state that $\lnot (q \notin X)$ is equivalent to $q \in X$ when writing a proof?

Prove a DAG can be obtained by an undirected graph's longest cycle

Attempt to proof following statement (kernel and image of a matrix)

Fibonacci gcd proof

$E[E[X\mid Y] =$ $\sum_{y\mid P(Y=y>0)}E[X\mid Y=y] \cdot P(Y =y)$

Proving that $0$ is an eigenvalue of this transformation

Where can I find the proofs of the properties of exponentiation when powers are members of ℕ, ℤ, ℚ, ℙ, and ℝ?

Show $p(x_n)$ $\rightarrow$ $p(x)$ for a convergent sequence $\{ x_n \}$

Exercise about subspaces of $\mathbb{R}^n$

A subset $A\subset \mathbb R^n$ is compact iff every nested sequence of relatively closed, non-empty subsets of $A$ has non-empty intersection.

Sequential compactness and boundedness

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