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University of Florence


Oct
22
revised Dividing by 2 numbers at once, what is the answer?
added 246 characters in body
Oct
22
revised Dividing by 2 numbers at once, what is the answer?
added 246 characters in body
Oct
22
revised Dividing by 2 numbers at once, what is the answer?
added 246 characters in body
Oct
22
answered Dividing by 2 numbers at once, what is the answer?
Oct
22
comment Dividing by 2 numbers at once, what is the answer?
While sums and moltiplications associate on the left, it is a good convention that powers associate to the right: A^B^C = A^(B^C). This because $(A^B)^C$ can be written anyway without parenthesis as $A^{BC}$. Python (and maybe other programming languages) agrees with this convention.
Oct
22
answered Find absolute maximum and minimum with domain
Oct
22
revised Find absolute maximum and minimum with domain
revert and correct previous fix
Oct
20
answered Definite method for finding the intersection of two cartesian lines in 3D.
Oct
20
answered What does the nullity of T have to do with if it's isomorphic or not?
Oct
20
revised Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
added 11 characters in body
Oct
14
comment Is value of $\pi = 4$?
I don't think this answers the question. The OP has correctly computed the length of the staircase and, apparently, he knows that $\pi \neq 4$. So he knows the reasoning is wrong (or at least contradictory) but he is asking which step fails.
Oct
11
revised In high school statistics, why does it seem like equations come out of the sky
added 9 characters in body
Oct
9
comment If $f$ is an increasing function defined on $[a,b]$ . Then, $f$ has countable number of discontinuities
Points of continuity must only be searched into the domain of the function, since the definition of continuity requires the value of the function to be computed in the point. If you decide that a function is not continuous where it is not defined, then the function $f(x) = \sqrt(x)$ would be discontinuous for every $x<0$ which is a not-countable set.
Oct
1
comment About Banach Spaces And Absolute Convergence Of Seires
Choose $n_k$ so that $|x_m - x_{n_k}|<2^{-k}$ for all $m>n_k$. This is possible by the definition of Cauchy sequence.
Sep
30
awarded  Explainer
Sep
29
revised Choosing two random numbers in $(0,1)$ what is the probability that sum of them is more than $1$?
[Edit removed during grace period]
Sep
24
awarded  Autobiographer
Sep
21
revised How to find $F(x) = \int_x^{x^2} (2+\sqrt t )\, dt$ ?
deleted 36 characters in body
Sep
21
comment How to find $F(x) = \int_x^{x^2} (2+\sqrt t )\, dt$ ?
Write the intermediate passages
Sep
15
comment existence of a differentiable function under certain given condition
The requirements on $f(0)$ and $f'(0)$ don't mean anything. Maybe it was $x=0$?