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Nov
4
answered Show that if $x>0$, then $\ln(x)\geq 1-\frac{1}{x} $
Nov
2
comment Integration in n-spherical coordinates
Thanks, I've already got an answer on physics.SE: physics.stackexchange.com/questions/83103/…
Oct
31
asked Integration in n-spherical coordinates
Oct
13
comment Divergence in spherical coordinates
@user8268 So if $\vec F$ is defined as: $F^\alpha = \frac{\partial f (u(r, \theta, \phi), \ldots)}{\partial (\nabla_\alpha u)}$ and I compute $\nabla_\alpha u$ as $(\partial_r u, \frac{1}{r} \partial_\theta u, \frac{1}{r \sin \theta} \partial_\phi u)$ than which formula for $\nabla \cdot \vec{F}$ should I use? The first one?
Oct
13
asked Divergence in spherical coordinates
Aug
9
awarded  Necromancer
Jun
26
comment Solving the integral $\int_{0}^{\infty} \frac{\sin{x}}{x} \ dx = \frac{\pi}{2}$?
@André indeed, thanks.
Jun
26
revised Solving the integral $\int_{0}^{\infty} \frac{\sin{x}}{x} \ dx = \frac{\pi}{2}$?
fixed typo
May
24
comment Improper integral and special functions
@RaymondManzoni thank you.
May
24
accepted Improper integral and special functions
May
24
asked Improper integral and special functions
May
17
awarded  Yearling
May
14
awarded  Nice Answer
Feb
8
awarded  Nice Answer
Sep
16
awarded  Revival
Sep
16
answered Find the functions family that satisfies the inequality $\int_0^1 \frac{dx}{1+f^{2}(x)} <\frac{f(1)}{f'{(1)}}$
Aug
20
answered Solving the integral $\int_{0}^{\infty} \frac{\sin{x}}{x} \ dx = \frac{\pi}{2}$?
Jul
26
comment Sum equals integral
Thank you for your answer. These references are very helpful.
Jul
26
accepted Sum equals integral
Jul
26
awarded  Nice Question