Question

Check the correct sign $\pm$ in $( Ve^{-j(wt+A)})/(Ie^{-j(wt+B)})=(V/I)\cdot[\cos(A-B) \pm j\sin(A-B)]$

score 46 · Answer 1 · 2026-04-15 20:04:10

46

Views

Check the correct sign $\pm$ in $( Ve^{-j(wt+A)})/(Ie^{-j(wt+B)})=(V/I)\cdot[\cos(A-B) \pm j\sin(A-B)]$

Published on 15 Apr 2026 - 20:04

score 56 · Answer 2 · 2026-04-14 13:46:34

56

Views

Volumes of bodies in $\mathbb R^3$ and $\mathbb R^6$

Published on 14 Apr 2026 - 13:46

score 54 · Answer 3 · 2026-04-16 00:38:32

54

Views

Integrally closed domains, where is the reduced hypothesis used?

Published on 16 Apr 2026 - 0:38

score 67 · Answer 4 · 2026-04-16 06:15:42

67

Views

Finding conditional pdf, conditional expectation, and conditional variance

Published on 16 Apr 2026 - 6:15

score 163 · Answer 5 · 2026-04-15 11:16:02

163

Views

If $f$ is a permutation and $f=f\circ f\circ\cdots$, then $f$ is the identity function on its domain

Published on 15 Apr 2026 - 11:16

score 489 · Answer 6 · 2026-04-16 10:22:55

489

Views

Show that if $f$ continuous, $f(x_0) = c > 0$, then $\exists$ interval with $x_0$ such that $f(x) > c/2$ for every $x \in I$.

Published on 16 Apr 2026 - 10:22

score 91 · Answer 7 · 2026-04-14 02:19:47

91

Views

Proof by induction that $\frac13(n^3-n)$ is an integer. Am I on the correct path?

Published on 14 Apr 2026 - 2:19

score 153 · Answer 8 · 2026-04-11 01:05:32

153

Views

Proof verification: For $a$, $b$, $c$ positive with $abc=1$, show $\sum_{\text{cyc}}\frac{1}{a^3(b+c)}\geq \frac32$

Published on 11 Apr 2026 - 1:05

score 333 · Answer 9 · 2026-04-13 18:04:20

333

Views

Part of proof that supremum norm is (positive) definite. $||f||_\infty =0 \implies f=0$.

Published on 13 Apr 2026 - 18:04

score 151 · Answer 10 · 2026-04-17 01:18:04

151

Views

Determine number of all $\left\{P,Q,R,k \right\}$, such that $P_{(2k)}-Q_{(k)}=(R_{(k)})^2$

Published on 17 Apr 2026 - 1:18

score 116 · Answer 11 · 2026-04-14 22:56:49

116

Views

Is this proof for $\sum^n_{i=1} i= \frac{n^2+n}{2}$ correct?

Published on 14 Apr 2026 - 22:56

score 908 · Answer 12 · 2026-04-14 13:48:09

908

Views

Is there an arithmetic proof to the AM GM Inequality for 3 variables?

Published on 14 Apr 2026 - 13:48

score 64 · Answer 13 · 2026-04-15 03:17:10

64

Views

Algorithm to find if a triangle (with given vertices) contains a point $P$

Published on 15 Apr 2026 - 3:17

score 244 · Answer 14 · 2026-04-15 02:17:40

244

Views

If a series of functions satisfies the Cauchy criterion uniformly, then the series converges uniformly on $S$

Published on 15 Apr 2026 - 2:17

score 122 · Answer 15 · 2026-04-10 15:01:54

122

Views

Defining Addition of Natural Numbers as the Algebra of 'Push-Along' Functions

Published on 10 Apr 2026 - 15:01

List Question

Check the correct sign $\pm$ in $( Ve^{-j(wt+A)})/(Ie^{-j(wt+B)})=(V/I)\cdot[\cos(A-B) \pm j\sin(A-B)]$

Volumes of bodies in $\mathbb R^3$ and $\mathbb R^6$

Integrally closed domains, where is the reduced hypothesis used?

Finding conditional pdf, conditional expectation, and conditional variance

If $f$ is a permutation and $f=f\circ f\circ\cdots$, then $f$ is the identity function on its domain

Show that if $f$ continuous, $f(x_0) = c > 0$, then $\exists$ interval with $x_0$ such that $f(x) > c/2$ for every $x \in I$.

Proof by induction that $\frac13(n^3-n)$ is an integer. Am I on the correct path?

Proof verification: For $a$, $b$, $c$ positive with $abc=1$, show $\sum_{\text{cyc}}\frac{1}{a^3(b+c)}\geq \frac32$

Part of proof that supremum norm is (positive) definite. $||f||_\infty =0 \implies f=0$.

Determine number of all $\left\{P,Q,R,k \right\}$, such that $P_{(2k)}-Q_{(k)}=(R_{(k)})^2$

Is this proof for $\sum^n_{i=1} i= \frac{n^2+n}{2}$ correct?

Is there an arithmetic proof to the AM GM Inequality for 3 variables?

Algorithm to find if a triangle (with given vertices) contains a point $P$

If a series of functions satisfies the Cauchy criterion uniformly, then the series converges uniformly on $S$

Defining Addition of Natural Numbers as the Algebra of 'Push-Along' Functions

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