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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)


13h
answered $ \sum_{n=1}^{\infty}a_{n} $ diverges but $ \sum_{n=1}^{\infty}\frac{a_{n}}{1+a_{n}^{2}} $ sometimes converges and sometime diverges.
Jan
13
answered convergence of $\prod_{n=1}^\infty (1-\frac{z}{n!})$
Jan
3
answered C*-algebras: Literature?
Jan
2
answered Find this limit: $ \lim_{n \to \infty}{(e^{\frac{1}{n}} - \frac{2}{n})^n}$
Jan
1
asked $ \|u(x)+u(x)-x +o(\|x\|^p)\|<r $?
Dec
27
asked $ C^p_0(B,\mathbb{X})$ is a Banach space with the norm of $C^p\!\!$-topology?
Dec
26
answered If $f'(z_0)\neq 0$ then $f$ is one to one on some open disk $D_r(z_0)$
Dec
9
answered Set notation equivalence of AND & OR
Dec
2
answered The inverse of a bijective holomorphic function
Dec
1
answered Real analysis book suggestion
Nov
30
answered “Honest” introductory real analysis book
Nov
28
answered Show a limit of a bounded function is 0 then solving the integral
Nov
26
answered find the upper bound on a vector
Nov
16
asked Extending the domain of the “greatest common divisor” function.
Nov
3
answered How can we solve the integral $\int_\epsilon^1 e^{x^n\log x }\mathrm{d}x$?
Nov
2
asked How can we solve the integral $\int_\epsilon^1 e^{x^n\log x }\mathrm{d}x$?
Oct
26
answered How to evaluate $ \int_{0}^{1} x^{x^{x^{x^…}}} dx $
Oct
26
asked Legendre transform and Minimax Theorems.
Aug
31
answered Finding roots with seemingly no algebraic way
Jul
24
asked Banach Fixed Point Theorem. Measurable version.