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University of Florence


Mar
19
answered How does the exponent of a function effect the result?
Mar
18
revised How is $\{\emptyset,\{\emptyset,\emptyset\}\} = \{\{\emptyset\},\emptyset,\{\emptyset\}\}$?
added 156 characters in body
Mar
18
revised twice differentiable function
edited body
Mar
18
answered twice differentiable function
Mar
18
answered How is $\{\emptyset,\{\emptyset,\emptyset\}\} = \{\{\emptyset\},\emptyset,\{\emptyset\}\}$?
Mar
18
reviewed Approve suggested edit on Which convergence test should be used for this series?
Mar
18
comment derivative of the exponential integral
You can write it as $g * K_\sigma$ with $g(x) = -f(x) e^{-af(x)}$
Mar
18
comment derivative of the exponential integral
You are making a derivative with respect to a parameter $a$ which is not involved in convolution. Hence you simply differentiate with respect to $a$.
Mar
18
comment derivative of the exponential integral
yes............
Mar
18
answered derivative of the exponential integral
Mar
18
reviewed Approve suggested edit on How to calculate this particle's position, velocity and acceleration, each as functions of time.
Mar
17
answered Asymptotic running time in Big Theta notation
Mar
17
answered $f\circ g=g\circ f$ and continuity
Mar
17
answered Function to create a smooth, monotonically non-decreasing curve between three points
Mar
17
comment closed unit ball in a Banach space is closed in the weak topology
I suspect that $||x||=\sup \{\lambda x \colon \lambda\in V', ||\lambda||=1\}$ uses Hahn-Banach.
Mar
17
comment closed unit ball in a Banach space is closed in the weak topology
In the first sentence you mean: for all $\lambda \in V'$, right?
Mar
16
answered Does $dx$ in the formula $\int f(x)dx$ represents a differential of x?
Mar
16
comment Homeomorphism on the unit circle
$f^{-1}(f(2\pi-1/n)) = 2\pi-1/n \to 2\pi$.
Mar
16
answered Checking multivariable function's differentiability at $(0,0)$
Mar
16
comment Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
+1, the picture says it all