Question

Verify my proof: $B \cup(\bigcup \mathcal F) = \bigcup(\mathcal F \cup \{B\})$

score 50 · Answer 1 · 2026-04-14 06:41:10

50

Views

Verify my proof: $B \cup(\bigcup \mathcal F) = \bigcup(\mathcal F \cup \{B\})$

Published on 14 Apr 2026 - 6:41

score 41 · Answer 2 · 2026-04-16 23:20:13

41

Views

domain of definition of a semilinear PDE $x∂_xz + y∂_yz = −z^2$

Published on 16 Apr 2026 - 23:20

score 18 · Answer 3 · 2026-04-17 00:51:09

18

Views

The Radio-1-number of any Path Graph is 1.

Published on 17 Apr 2026 - 0:51

score 70 · Answer 4 · 2026-04-17 01:02:02

70

Views

If $a_1,b_1,a_2,b_2\in\mathbb{N};\ (a_1,b_1)\neq (a_2,b_2),$ show that $\frac{1}{2^{a_1}}+\frac{1}{3^{b_1}}\neq\frac{1}{2^{a_2}}+\frac{1}{3^{b_2}}.$

Published on 17 Apr 2026 - 1:02

score 31 · Answer 5 · 2026-04-11 22:22:25

31

Views

Problem with a multivariable stochastic exercise

Published on 11 Apr 2026 - 22:22

score 107 · Answer 6 · 2026-04-10 20:46:10

107

Views

How can one obtain the resulting 3D rotation matrix by "integrating" over some time-dependent angular velocity vector?

Published on 10 Apr 2026 - 20:46

score 60 · Answer 7 · 2026-04-14 07:16:22

60

Views

Show a sequence of functions converge to 0 a.e.

Published on 14 Apr 2026 - 7:16

score 130 · Answer 8 · 2026-03-28 08:35:34

130

Views

If $f''(x) + f'(x)g(x) - f(x) = f(a) = f(b) = 0$, then $f = 0$ on $[a,b]$

Published on 28 Mar 2026 - 8:35

score 124 · Answer 9 · 2026-03-26 12:48:23

124

Views

Proving autocorrelation is periodic for a wide sense stationary

Published on 26 Mar 2026 - 12:48

score 103 · Answer 10 · 2026-04-16 10:53:50

103

Views

Prove that if $\frac ab=\frac bc=\frac cd$, then $\frac ad=\frac {a^3+b^3+c^3}{b^3+c^3+d^3}$

Published on 16 Apr 2026 - 10:53

score 41 · Answer 11 · 2026-05-16 00:16:30

41

Views

Integral: $\int_D = (x^2 + y)dx + (x-y)dy$, $D$ is an arc of parabola $x = y^2$ oriented in such way that it starts in $(1,1)$ and ends in $(1,-1)$

Published on 16 May 2026 - 0:16

score 131 · Answer 12 · 2026-04-14 17:14:43

131

Views

Find the number of distinct positive divisors of $2^23^25^3$.

Published on 14 Apr 2026 - 17:14

score 278 · Answer 13 · 2026-04-10 06:56:21

278

Views

Why am I getting different answers using different methods?

Published on 10 Apr 2026 - 6:56

score 738 · Answer 14 · 2026-04-17 17:45:23

738

Views

Test the convergence of the series $1+\frac{2^2}{3^2}+\frac{2^2.4^2}{3^2.5^2}+\frac{2^2.4^2.6^2}{3^2.5^2.7^2}+\cdots$

Published on 17 Apr 2026 - 17:45

score 58 · Answer 15 · 2026-05-03 17:44:05

58

Views

Equivalence of two different formulations of neighborhood systems in a set

Published on 03 May 2026 - 17:44

List Question

Verify my proof: $B \cup(\bigcup \mathcal F) = \bigcup(\mathcal F \cup \{B\})$

domain of definition of a semilinear PDE $x∂_xz + y∂_yz = −z^2$

The Radio-1-number of any Path Graph is 1.

If $a_1,b_1,a_2,b_2\in\mathbb{N};\ (a_1,b_1)\neq (a_2,b_2),$ show that $\frac{1}{2^{a_1}}+\frac{1}{3^{b_1}}\neq\frac{1}{2^{a_2}}+\frac{1}{3^{b_2}}.$

Problem with a multivariable stochastic exercise

How can one obtain the resulting 3D rotation matrix by "integrating" over some time-dependent angular velocity vector?

Show a sequence of functions converge to 0 a.e.

If $f''(x) + f'(x)g(x) - f(x) = f(a) = f(b) = 0$, then $f = 0$ on $[a,b]$

Proving autocorrelation is periodic for a wide sense stationary

Prove that if $\frac ab=\frac bc=\frac cd$, then $\frac ad=\frac {a^3+b^3+c^3}{b^3+c^3+d^3}$

Integral: $\int_D = (x^2 + y)dx + (x-y)dy$, $D$ is an arc of parabola $x = y^2$ oriented in such way that it starts in $(1,1)$ and ends in $(1,-1)$

Find the number of distinct positive divisors of $2^23^25^3$.

Why am I getting different answers using different methods?

Test the convergence of the series $1+\frac{2^2}{3^2}+\frac{2^2.4^2}{3^2.5^2}+\frac{2^2.4^2.6^2}{3^2.5^2.7^2}+\cdots$

Equivalence of two different formulations of neighborhood systems in a set

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