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University of Florence


Dec
6
revised Show all roots of $\sum_{k=0}^n 2^{k(n-k)} x^k$ are real (December 6, 2014 Putnam problem)
deleted 8 characters in body
Nov
30
revised Continuity of addition map with lower limit topology
corrected
Nov
30
revised The infinite sum of the reciprocal of a strictly increasing sequence is irrational if we place a limiting condition on the se quence itself
added 377 characters in body
Nov
28
revised set notation, find min
added 557 characters in body
Nov
23
revised How can I find the example of $f(x)$ such that $\,\lim_{x\to\infty}f(x) \neq 0$?
deleted 70 characters in body
Nov
11
revised About Banach Spaces And Absolute Convergence Of Series
typo
Nov
7
revised Limit of derivatives and continuous
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Nov
6
revised If $f$ is bounded and twice differentiable in $\mathbb{R}$, show that there exists $\xi\in\mathbb{R}$, s.t. $f''(\xi)=0$.
added 40 characters in body
Nov
4
revised Why is $e^{-f(z)} = 1-z$, when $f(z)=\sum_{n=1}^\infty \frac{z^n}{n}$?
edited body; edited title
Oct
27
revised Intuition behind a certain limit.
added 188 characters in body
Oct
27
revised Show $(a_n)_{n=m}^{\infty}$ converges to $c$ iff $(a_n)_{n=m'}^{\infty}$ does.
missing part of statement
Oct
22
revised Determinant value of $2 \times 2$ matrices
added 78 characters in body
Oct
22
revised Determinant value of $2 \times 2$ matrices
added 78 characters in body
Oct
22
revised Determinant value of $2 \times 2$ matrices
added 10 characters in body
Oct
22
revised Dividing by 2 numbers at once, what is the answer?
added 4 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
revised Dividing by 2 numbers at once, what is the answer?
added 246 characters in body
Oct
22
revised Find absolute maximum and minimum with domain
revert and correct previous fix
Oct
20
revised Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
added 11 characters in body