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Dec
6
reviewed Approve Fourier Transform of $1/(\pi\cdot t)$ by Duality
Dec
5
reviewed Approve Prove that $ y''(0) = -1, x = \cos\left(\frac{t}{1+t}\right), y = \sin\left(\frac{t}{1+t}\right)$
Dec
3
reviewed Edit Solving linear first order differential equation with hard integral
Dec
3
revised Solving linear first order differential equation with hard integral
improved format
Dec
1
revised Confused on a question on sets and functions
typo
Dec
1
revised Confused on a question on sets and functions
typo
Dec
1
reviewed Approve Consider ODE ; find solution(s).
Nov
30
reviewed Approve the greatest value of an implicit function
Nov
30
comment What is the value of $a+b+c$?
You should post a new question if you have another question.
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