Question

Proof that the $\sup \left(a,b\right) = b$.

score 153 · Answer 1 · 2018-07-19 23:32:52

153

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Proof that the $\sup \left(a,b\right) = b$.

Published on 19 Jul 2018 - 23:32

score 512 · Answer 2 · 2026-03-26 10:43:35

512

Views

If $V,W$ are finite-dimensional and $T: V \to W$ , $S: W \to V$ are injective linear maps then $T$ is an isomorphism

Published on 26 Mar 2026 - 10:43

score 2.4k · Answer 3 · 2018-07-20 03:01:40

2.4k

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Two balls are selected at random from a bag with three red balls and two yellow balls. Find

Published on 20 Jul 2018 - 3:01

score 2.6k · Answer 4 · 2026-04-01 22:32:59

2.6k

Views

Every compact metric space is complete, proof verification

Published on 01 Apr 2026 - 22:32

score 53 · Answer 5 · 2018-07-20 09:17:57

53

Views

Proof of $P(X|Y) = \sum_z P(X,z | Y)$ (check my solution)

Published on 20 Jul 2018 - 9:17

score 345 · Answer 6 · 2026-03-25 21:49:45

345

Views

Check proof that $\tan(x+\sin(x))$ is periodic and find its period

Published on 25 Mar 2026 - 21:49

score 98 · Answer 7 · 2018-07-20 12:29:06

98

Views

Check proof that $\sin\sqrt{|x|}$ is not periodic

Published on 20 Jul 2018 - 12:29

score 243 · Answer 8 · 2026-03-25 23:36:41

243

Views

Prove: $\log_2(x)+\log_3(x)+\log_5(x)>9\log_{30}(x)$

Published on 25 Mar 2026 - 23:36

score 215 · Answer 9 · 2018-07-20 16:09:52

215

Views

knowing: $\cos x+\sin x=\frac{5}{4}$, obtain: $\cos(4x)$

Published on 20 Jul 2018 - 16:09

score 32 · Answer 10 · 2018-07-20 17:02:05

32

Views

Check proof that $h(x) = a\sin{p_1x\over q_1}+b\cos{p_2x \over q_2}$ is periodic and find its period

Published on 20 Jul 2018 - 17:02

score 1.7k · Answer 11 · 2026-03-25 07:42:22

1.7k

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A proof of the third Sylow theorem

Published on 25 Mar 2026 - 7:42

score 86 · Answer 12 · 2018-07-20 20:16:22

86

Views

For $f(x) = \int_1^x \frac{dt}{t}$ prove that $f^{-1}(y) = \frac{d}{dy}f^{-1}(y)$

Published on 20 Jul 2018 - 20:16

score 1.7k · Answer 13 · 2026-03-26 17:50:22

1.7k

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Find the value of the constant $A$ given the particle has the wavefunction $\psi(x,t=0)=A\cos^{3}\left(\frac{\pi x}{2a}\right)$

Published on 26 Mar 2026 - 17:50

score 298 · Answer 14 · 2018-07-21 01:14:24

298

Views

Is this proof of the Cancellation Law for multiplication of real numbers correct?

Published on 21 Jul 2018 - 1:14

score 970 · Answer 15 · 2018-07-21 03:28:39

970

Views

Proving Countable Additivity From Finite Additivity

Published on 21 Jul 2018 - 3:28

List Question

Proof that the $\sup \left(a,b\right) = b$.

If $V,W$ are finite-dimensional and $T: V \to W$ , $S: W \to V$ are injective linear maps then $T$ is an isomorphism

Two balls are selected at random from a bag with three red balls and two yellow balls. Find

Every compact metric space is complete, proof verification

Proof of $P(X|Y) = \sum_z P(X,z | Y)$ (check my solution)

Check proof that $\tan(x+\sin(x))$ is periodic and find its period

Check proof that $\sin\sqrt{|x|}$ is not periodic

Prove: $\log_2(x)+\log_3(x)+\log_5(x)>9\log_{30}(x)$

knowing: $\cos x+\sin x=\frac{5}{4}$, obtain: $\cos(4x)$

Check proof that $h(x) = a\sin{p_1x\over q_1}+b\cos{p_2x \over q_2}$ is periodic and find its period

A proof of the third Sylow theorem

For $f(x) = \int_1^x \frac{dt}{t}$ prove that $f^{-1}(y) = \frac{d}{dy}f^{-1}(y)$

Find the value of the constant $A$ given the particle has the wavefunction $\psi(x,t=0)=A\cos^{3}\left(\frac{\pi x}{2a}\right)$

Is this proof of the Cancellation Law for multiplication of real numbers correct?

Proving Countable Additivity From Finite Additivity

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