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Mar
19
asked How do you apply an element on the left of a permutation?
Mar
19
accepted What about my proof is “nonsense”?
Mar
18
answered What about my proof is “nonsense”?
Mar
18
comment What about my proof is “nonsense”?
@MikeMiller: I was thinking, that $x = ah$ for some $a \in G$ and $h \in H (\leq G)$, by closure of multiplication it has to be a member of $G$? Does this not make that much sense?
Mar
18
asked What about my proof is “nonsense”?
Mar
17
comment When does function composition commute?
I think the example is correct, but the math is wrong: $f(g(x)) = (x^2)^3 = g(f(x)) = (x^3)^2 = x^6$
Mar
16
comment Help with proving property of Rubik's cube.
@vadim123: Now that you say it, I can see it. There always exists a side that can be rotated four times for $C_2$. But you can do this to to get two other sides that don't touch $C_1$ and touch all 7 other cubicles. Thank you for the help!
Mar
16
asked Help with proving property of Rubik's cube.
Mar
14
accepted How should I continue my proof of this cycle property? (And did I make a mistake?)
Mar
14
comment How should I continue my proof of this cycle property? (And did I make a mistake?)
Also, I would edit it (except it doesn't meet the minimum 6 chars needed), but I am fairly certain you mean $x(a_i)$ not $x(a_1)$.
Mar
14
comment How should I continue my proof of this cycle property? (And did I make a mistake?)
Thanks, I get it know! Sorry for the late reply some stuff came up.
Mar
13
asked How should I continue my proof of this cycle property? (And did I make a mistake?)
Mar
1
comment Use $\sum_{n=1}^\infty \frac{1}{n^4} = \frac{\pi^4}{90}$ to compute $\sum_{n=1}^\infty \frac{(-1)^n}{n^4}$
Wait, I think I'm reading this wrong, but if $k$ is fixed, then it is either going to be $\frac{\pi^4}{90}$ or the negative of that. Do you mean $-1^n$?
Feb
27
comment Apply Cauchy-Schwarz to vector?
Sorry this is a better link: en.wikipedia.org/wiki/Cauchy%E2%80%93Schwarz_inequality#Rn
Feb
27
comment Apply Cauchy-Schwarz to vector?
They have both. Under special cases they have $\mathbb{R}^n$
Feb
27
comment Apply Cauchy-Schwarz to vector?
They have the case for $\mathbb{R}^n$ on wikipedia: en.wikipedia.org/wiki/Cauchy%E2%80%93Schwarz_inequality With the proof.
Feb
23
comment Put this word problem into math terms: A man goes to a stream…
Specifically the part about 2. Die Hard
Feb
23
comment Put this word problem into math terms: A man goes to a stream…
You may want to look at this: ocw.mit.edu/courses/electrical-engineering-and-computer-science/…
Feb
18
comment Where does the function $f(x) =\Big[\frac{1}{2}*x\Big]$ contain discontinuities, left or right continuous?
@amWhy: Sorry, recently went of a released exam that used awkward notation. Used brackets as fractional part.
Feb
18
revised Where does the function $f(x) =\Big[\frac{1}{2}*x\Big]$ contain discontinuities, left or right continuous?
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