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University of Florence


2d
revised Method for computing limit of a sin function as x tends to zero
sign
2d
answered Show that for $(X,d)$ a metric space, $U= \{x \in X: d(x, C) \leq d(p, C)\}$ is a closed set
Aug
10
answered Can I say that an implicit function of space (3D) always has 3 unknowns?
Aug
7
comment Uniform continuity of a subset of $R$
I'm saying that you don't need the concept of limit to define continuity nor uniform continuity. As a matter of fact every function defined on $\{1,2,3\}$ is uniformly continuous.
Aug
7
answered Optimality conditions
Aug
7
revised Uniform continuity of a subset of $R$
added 641 characters in body
Aug
7
answered Uniform continuity of a subset of $R$
Aug
7
revised Multivariable-calculus, derivative and second derivative
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Aug
1
answered Mathematical proof for order of operations
Jul
26
awarded  Nice Answer
Jul
22
revised Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
added 414 characters in body
Jul
22
revised Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
edited body
Jul
22
comment Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
The projection map is the map which sends every point of the plane into the closest point on the convex set.
Jul
22
answered Can a convex polygon inside a square with edge length 1 have a perimeter > 4?
Jul
22
revised Significance of starting the Fibonacci sequence with 0, 1…
typo
Jul
21
answered How find all possible lengths of AD Quadrilateral ABCD?
Jul
20
comment (Dis)continuity of function in $R^2$
You have to carefully identify what is the boundary of the set $\{(x,y) \colon x^2>2+x \wedge y<6 \}$. In this case you find that this boundary is composed by four half-lines.
Jul
20
answered Find range of values
Jul
20
answered Are there any well known mathematicians who published very little?
Jul
20
answered (Dis)continuity of function in $R^2$