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seen Jul 25 at 20:18

Apr
19
awarded  Analytical
Apr
19
comment Solutions to $x_1+2x_2+3x_3+4x_4+5x_5+6x_6+7x_7+8x_8+9x_9+10x_{10}\equiv0\mod11$
You did not read the question quite carefully.
Apr
19
awarded  Critic
Apr
18
comment Maximum of an entire function
Yes, your theorem is true. This is a proof by contradiction.
Apr
17
comment rotating a matrix
XKCD may be helpful in solving this question. xkcd.com/184
Apr
17
comment Is there a way to tell whether a paper has been rigorously peer-reviewed and is completely valid?
If it's in an important magazine, other professionals have had a look, so you can be fairly sure years of study won't help reliability.
Apr
17
comment Integral equation solution hint.
Necessarily, $\lim_{x\to\infty}f(x)=0$, if that helps.
Apr
17
comment Show that for a finite metric space A, every subset is open
Viewing problems in a more general light can sometimes help. In this case, an abstract question (about open and closed sets) is asked, and I clarified it by the more intuitive understanding of discrete spaces. And apparently the question owner was helped.
Apr
17
awarded  Commentator
Apr
17
comment Show that for a finite metric space A, every subset is open
Well, I can't quite agree; mathematics is all about transformation of problem statements. In this case I transformed the problem into the direct application of a well-known theorem.
Apr
17
answered Show that for a finite metric space A, every subset is open
Apr
17
comment Generating $3\times 3$ Unitary Matrices close to the Identity
You can try generating an orthonormal base, which will then be the rows or columns of your unitary matrix.
Apr
17
comment Evaluating $\sqrt{6+\sqrt{6+\cdots}}$
@Julian, i'd say so too, but that's not what it said :)
Apr
17
comment Evaluating $\sqrt{6+\sqrt{6+\cdots}}$
The questions asked are: 1. prove that $|x_{n+1}-3|\leq \frac{1}{5}|x_n-3|$. 2. prove that$|x_n-3|\leq \frac{1}{5}\exp(n-1)$. 3. conclude that $x_n$ converges to 3. Have I got this right?
Apr
16
answered eventually increasing function?
Apr
16
revised Does this inequality hold
added 4 characters in body
Apr
16
answered Does this inequality hold
Apr
16
answered Prove that the integral of an odd step function on [-1,1] is 0
Apr
16
comment solving matrix equation
I don't get the question. Let A=0, then surely no such X exists. Also, please remove those irrelevant tags.
Apr
16
comment Is this Hermitian matrix positive definite?
It is obviously true when $A$ is real.