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1619
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location Italy
age 47
visits member for 3 years, 6 months
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Mathematical Physics researcher. Linux user from 1996. C programmer from 1996 to 2002. Mainly oriented to shell programming, package management tools and in general to command line.


1d
revised The limit of $((1+x)^{1/x} - e+ ex/2)/x^2$ as $x\to 0$
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1d
revised If $A,B$ are invertible so $AB$ is invertible
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1d
revised Find the pair of values $a[i]$, $a[j]$ such that $a[i]\,\&\,a[j]$ is maximum
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1d
revised Smooth surfaces that isn't the zero-set of $f(x,y,z)$
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1d
revised Help with Complex integration
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Jul
25
revised Parametrizing to Calculate Flux
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Jul
25
revised Finite integral with goniometric functions, $\int_0^{\infty} \frac{8\sin^4(\pi f t)\tan^2(\pi f/2)}{(\pi^4 \tau^2 f^3) }df$
edited title
Jul
25
awarded  Curious
Jul
24
asked Find unknown such that four dependent quantities have the same value.
Jul
24
answered Evaluate $\int_C \nabla(r^4) \cdot \hat n ds$ in terms of moments of inertia…
Jul
24
comment Evaluate $\int_C \nabla(r^4) \cdot \hat n ds$ in terms of moments of inertia…
$\hat n$ is what you write only for a circle centered in $O$. For a general curve you have $$\hat n = \frac{-\dot y\hat i+\dot x\hat j}{\sqrt{\dot x^2+\dot y^2}}$$
Jul
24
revised Evaluate $\int_C \nabla(r^4) \cdot \hat n ds$ in terms of moments of inertia…
added 4 characters in body
Jul
24
comment Diagonalization with the given eigenvalue and its vector
It should be: "each of its rows and columns is a linear combinations of the others"
Jul
24
revised approximation of $\log(1+z)=z$ as $z\to 0$
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Jul
24
revised Diagonalization with the given eigenvalue and its vector
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Jul
24
revised Show that the image of a linear transformation is equal to the kernel
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Jul
23
revised Parametrizing to Calculate Flux
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Jul
23
comment Ambiguous Limits in Area Determination
There is not a general rule, the text of the exercise should say this in a way or another.
Jul
23
comment Calculus - inequality problem.
You have and $=$ sign in the first abs. of the first line?
Jul
23
revised Which one is correct for $\sqrt{-16} \times \sqrt{-1}$? $4$ or $-4$?
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