Neighbourhood Of Any Point
59839
In $\epsilon$-$\delta$ continuity over an interval, $|x-c|<\delta$ implies $|f(x)-f(c)|<\epsilon$. Since both $c$ and $x$ vary, what's the difference?
63313
Uniqueness of Powerseries in an arbitrarily small neighborhood of $0$ in $\mathbb C$
124036
Open affine neighborhood of points
21938
describing all possible topologies on a set
57992
choosing points interior to a square
80524
Path-connected and locally connected space that is not locally path-connected
2597
Line between points in projective space?
10044
Points at integer distance
63765
How to find nearest cities in a given radius?
22327
Close by or nearby?
87558
Reflecting points on a square to make it larger
73304
Closest points on two line segments
158018
Everywhere Super Dense Subset of $\mathbb{R}$
94925
Closest line to a point using PostGIS?
92114
Approximating $\arctan x$ for large $|x|$
35069
Connectedness of the boundary
158599
Find the area where dog can roam