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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?
deleted 98 characters in body
Feb
18
revised Does my proof about convergent sequences look ok?
Added latex.
Feb
18
answered Where does the function $f(x) =\Big[\frac{1}{2}*x\Big]$ contain discontinuities, left or right continuous?
Feb
18
suggested approved edit on Does my proof about convergent sequences look ok?
Feb
17
revised How do I put this differential equation into mathcad 11
Added equation.