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Jul
20
revised Sum of roots of unity, proving that $1+w+w^2…+w^{n-1}=0$
added 2 characters in body
Jul
15
comment Show that $\lim\limits_n \frac{a_n}{a_{n+1}} = z_0$
This should have been closed as a duplicate of math.stackexchange.com/questions/420642 (there are others too). But because of the bounty, it can't be closed.
Jul
7
revised My MATLAB simulation shows that the Monty Hall probabilites are different… Why?
long pieces of code look better indented four spaces (no ` needed)
Jul
7
awarded  Good Answer
Jul
7
comment principal arguement of a complex number. principal argZ1 = a and principal argZ2=b . what will be arguement of (Z1.Z2) when a+b is greater than pi.
Then $a+b-\pi$ is an angle in the first quadrant, so that can't be right.
Jul
7
answered principal arguement of a complex number. principal argZ1 = a and principal argZ2=b . what will be arguement of (Z1.Z2) when a+b is greater than pi.
Jul
7
awarded  Nice Answer
Jul
6
comment Is there an algorithm to compute the degree of a polynomial?
@HagenvonEitzen or if the coefficients are positive.
Jul
6
revised Is there an algorithm to compute the degree of a polynomial?
added 401 characters in body
Jul
6
answered Is there an algorithm to compute the degree of a polynomial?
Jul
6
comment Does the $5x + 1$ sequence for 7 reach a power of 2 or does it get stuck in a period?
The "5", "2" in there shouldn't be there, right? @Théophile Periodicity mod $8$ shows that the sequence doesn't hit $8$ and it can't hit $2$ or $4$ without first htting $8$.
Jul
6
reviewed Leave Open Basic absolute value property
Jul
6
answered Basic absolute value property
Jul
6
reviewed Leave Open Show that $f:X\to \mathbb{RP}^n$ factors through $S^n\to\mathbb{RP}^n$ iff $f^*:H^1(\mathbb{RP}^n,Z_2)\to H^1(X,Z_2)$ is zero
Jul
6
reviewed Close How do I show $\lim_{x\to\infty}f(x) = \lim_{x\to\infty} f '(x)=0$ if $\lim_{x\to\infty}f '(x)^2 + f(x)^3 = 0$?
Jul
6
reviewed Close Find the limit $\lim_{n \to \infty} \sum_{k=1}^n \frac{1}{k+n}$
Jul
6
reviewed Close Can anyone prove the second property of a the following metric? $d: C([a,b])\times C([a,b]) \to R ; \ \ \ d(f,g)=\int_{a}^{b}|f(t)-g(t)|dt$
Jul
6
answered Explanation of the isolated singularities
Jul
6
answered Analytic Functions on Upper Half Plane Satisfying Inequality
Jul
5
comment Area of the shaded part in rectangle
That "8" seems misplaced (serving no purpose at the moment).