Reputation
2,514
Top tag
Next privilege 3,000 Rep.
Cast close & reopen votes
Badges
1 5 23
Impact
~37k people reached

Jul
31
comment How following matrices equation is solved?
What do the $[]$ mean?
Jul
2
comment Show that $A^k$ has eigenvalues $\lambda^k$ and eigenvectors $v$.
I find your proof more simple, more direct, more general and more obvious, thus much better.
Jun
19
comment Why are these curves' points called rational?
Thanks for the answer and explanation
Jun
19
comment Why are these curves' points called rational?
Ok, thank you very much for the answer and the example. Which by the way... is it right? $i^4+i^4=2=\sqrt 2^4=4$? Should the curve have a $2$ coefficient multiplying the $x$ and $y$ terms?
Jun
17
comment Proposed proof of topological result
Other than that, I find it perfect. Try to separate paragraphs though, it's a bit hard to read.
Jun
17
comment Proposed proof of topological result
What's $(B,d)$ and $(A,d)$?
Jun
12
comment Solutions for $|x^2-5x+2|=4$
@BetterWorld That means they should also come as a solution when you consider the negative sign of the modulus, try it. You should discard those solutions when you get the from the positive values, and when consider the negative, $x=1$ should come out again.
Jun
12
comment Solutions for $|x^2-5x+2|=4$
@BetterWorld That just means they're not solutions, because they fail to satisfy the hypothesis that $x^2-x-1$ is positive, on which the solution depends.
Jun
12
comment Solutions for $|x^2-5x+2|=4$
You're very welcome! :) No need for sirs.
Jun
11
comment Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs
@Dargenn My result is $p=0.43$, and so the solution would be $0.57$.
Jun
11
comment Choosing $8$ shoes from $20$ different pairs of shoes to get at least two pairs
@Dargenn I'm sorry, $P$ should be $P=40\cdot39\cdot38\cdot\ldots\cdot33$, and this solution considers a different case the same set of shoes dissordered, so it's incomplete. You can divide by the number of permutations of the $8$ chosen shoes.
Jun
10
comment What is the limit of the below functions when n tends to inifinity?
First of all, welcome. Second, you shouldn't expect anyone here to do this for you. You must first expose what you know, what you have tried, and the problems you have doing these. Third, always try to format mathematical expressions, I did for you, please see the code to see how.
Jun
10
comment The most efficient way to find a minimal value in a 2 dimensional matrix.
@user3697176 I will add that.
Jun
10
comment Basis of $\mathbb{Q}[\sqrt[3]{2}]$
Can you express any element of the ring as a linear combination of those three? Are succesive values of $2^{1/3}$ contained in the ring?
Jun
10
comment The shortest path in a metric space with a given metric
@SiXUlm Have in mind what Alex said. The above is only valid for manifolds with a differentiable structure. Those are the easiest to visualize though, so you should start with them.
Jun
9
comment Continuous homorphisms between topological groups.
The main difference with topological continuity is that this (the one you expose) only requires to be so for neighbourhoods of the identity of the group. That is a big difference.
Jun
6
comment Coordinates on the sphere not global?
It's hard to say. Could you give the source of the book? In principle the only two points on the sphere with coordinates not entirely defined are the poles, for which there is no well defined longitude.
Jun
6
comment how to know in which range $\cos^{2}\theta $ $\le$ $\sin^{2}\theta$?
@Sten Thanks for pointing out!
Jun
6
comment How to prove that the Kronecker delta is the unique isotropic tensor of order 2?
wow, whole answer in math mode :D
May
11
comment How to do this integral.
@DanielFischer I edited the question with info about the original integral and result.