Reputation
3,287
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
12 30
Newest
 Nice Answer
Impact
~72k people reached

Nov
30
revised Trick for roots of symmetric polynomials
typos, using palindromic instead of symmetric
Nov
30
comment What is the value of $a+b+c$?
Can you show this "some algebra" and calculate the solution?
Nov
30
comment What is the value of $a+b+c$?
Can you calculate the solution?
Nov
29
answered Trick for roots of symmetric polynomials
Nov
27
revised System with two quadratic equations
I changed the title to something more meaningful
Nov
25
comment Why can ALL quadratic equations be solved by the quadratic formula?
$x-\alpha = x-\beta = 0$ would imply $\alpha=\beta=0$. Your proof needs the theorem from vieta. I can't see how you get to the result by adding equations 2 and 3 as you stated in the text. Sorry, but the whole proof is rather complicated and rather boring.
Nov
24
reviewed Reject An analytic characterization of eigenvalues of a Hermitan matrix.
Nov
24
comment How to find the sum of this : $\sqrt{1+\frac{1}{1^2}+\frac{1}{2^2}}+ \sqrt{1+\frac{1}{2^2}+\frac{1}{3^2}}+\sqrt{1+\frac{1}{3^2}+\frac{1}{4^2}}+…$
@user158108: $$n^2 \cdot (n+1)^2 + n^2 + (n+1)^2=n^4+2 n^3+3 n^2+2 n+1$$ But polynomial equations of type $$x^4+ax^3+bx^2+ax+1=0$$ can be transformed to $$(x^4+1)+ax(x^2+1)+bx=0$$ and further to $$x^2((x+\frac{1}{x})^2-2)+a(x+\frac{1}{x})+c)=0$$ Now the substitution $$y=x+\frac{1}{x}$$ can be used.
Nov
24
reviewed Approve What is this called: $ \frac{\partial^2f}{\partial x^2} + \frac{\partial^2f}{\partial y^2} = $ … Laplacian?
Nov
24
comment An interesting table of Prime Generating polynomials similar to $n^2+n+41$?
To me it seems that these are at least 5 questions.
Nov
24
reviewed Approve Low rank approximation using CVX toolbox in Matlab
Nov
24
comment Prove that $F(1) + F(3) + F(5) + … + F(2n-1) = F(2n)$
and you start with which $n$? For $n=1$ you get $0=f(1)=f(2)=?$
Nov
24
answered Prove that $F(1) + F(3) + F(5) + … + F(2n-1) = F(2n)$
Nov
24
comment Prove that $F(1) + F(3) + F(5) + … + F(2n-1) = F(2n)$
Why do you use two different notations for the numbers? Either $f(n)$ of $F(n)$. Then numbers are $0,1,1,2,3,5,\ldots$. So if $f(5)=5$ then $f(1)=1, f(3)=2$.
Nov
24
reviewed Edit Solving this trigonometric task
Nov
24
revised Solving this trigonometric task
Replaced photo of equation with actual LaTEX.
Nov
23
revised $x,y,z$ are positive real numbers and $x+y+z=1$ $\implies$ $\bigg(1+\dfrac 1x\bigg)\bigg(1+\dfrac 1y \bigg)\bigg(1+\dfrac 1z \bigg)\ge 64$?
typo
Nov
23
revised Prove $\text{rad}(I)/I$ is isomorphic to $\mathfrak{N}(R/I)$
latex
Nov
23
reviewed Approve Finding a limit for n tends to infinity
Nov
23
reviewed Approve Determine if $\displaystyle \int_3^{\infty}\frac{x+1}{\sqrt{x^4-x}}\,dx $ converges