6h
asked How to pigeonhole the primes between $p_n$ and $p_{n+1}^2$ for twin prime conjecture?
1d
asked Weird question about natural numbers. Obvious or not?
1d
accepted Does there exist a finite set of homogeneous polynomials (+ property) whose unique solution is equivalent to a finite sequence of naturals?
1d
asked Does there exist a finite set of homogeneous polynomials (+ property) whose unique solution is equivalent to a finite sequence of naturals?
1d
comment Circle Packing, Estimate only of number of smaller circles in a circle.
Does the circle of each unit differ in radius?
2d
comment How can I prove that $g\cdot H \cdot g^{-1}$ is also finite and has the same number of elements that $H$?
How is finite a hypothesis here, seems like a conclusion to me.
2d
comment If a linear operator between two normed linear spaces is continuous at one point, then it is continuous at all points.
I think I solved it, see the last paragraph above.
2d
revised If a linear operator between two normed linear spaces is continuous at one point, then it is continuous at all points.
added 147 characters in body
2d
asked If a linear operator between two normed linear spaces is continuous at one point, then it is continuous at all points.
2d
comment Another integral related to Fresnel integrals
What are $C$ and $S$ and $\rm Si$?
2d
answered The norm of a bounded linear operator has this formula: $\|T\| = \sup_{\|v\| = 1} \|T v\|$
2d
accepted The norm of a bounded linear operator has this formula: $\|T\| = \sup_{\|v\| = 1} \|T v\|$
2d
answered Rules for manipulating differential/ Leibniz notation?
2d
asked The norm of a bounded linear operator has this formula: $\|T\| = \sup_{\|v\| = 1} \|T v\|$
Aug
27
answered How to prove that the subsets of $\mathbb{N}$ that don't contain arithmetic progressions of some length form closed sets of a topology?
Aug
27
answered $f_n(x) = \left\lfloor \frac{\sin(2\pi (x / n + 1/ 4) + 1 }{2}\right\rfloor$ and related
Aug
27
asked $f_n(x) = \left\lfloor \frac{\sin(2\pi (x / n + 1/ 4) + 1 }{2}\right\rfloor$ and related
Aug
25
comment Show that the following mapping is a contraction.
What is $d_{\infty}$ again? I forgot :)
Aug
21
comment Please help me understand Analytic Density $\lim_{\sigma \to 1^+}\frac{1}{\zeta(\sigma)}\sum_{n \in A} \frac{1}{n^{\sigma}}$
Thanks @DanielFischer. I'll use that fact. But how do you prove that $\lim (\sigma - 1) \zeta(\sigma) = 1$ ?
Aug
21
asked Please help me understand Analytic Density $\lim_{\sigma \to 1^+}\frac{1}{\zeta(\sigma)}\sum_{n \in A} \frac{1}{n^{\sigma}}$
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