A subset of the plane such that the distance between two elements is an integer
73578
Do infinitely many points in a plane with integer distances lie on a line?
130156
Image of the union and intersection of sets.
127972
Can distance between two closed sets be zero?
11849
Size of a union of two sets
23203
Euclidean distance proof
55968
Expression of the Hyperbolic Distance in the Upper Half Plane
123939
N circles in the plane
111954
Computing the cardinality of a combinatorial set
1409
Proving that the given set has at most $2^{n-1}$ elements
34210
Connecting square vertexes with minimal road
100977
Infinite subset with pairwise comprime elements
60309
Let X be a subset of {1,2,...,2014}...
95373
Additive set function on a semiring of sets
75852
Using Pigeonhole Principle to prove two numbers in a subset of $[2n]$ divide each other
45485
Dimension of a subset
146204
Subsets sharing at most $i$ elements
97627
filling an occluded plane with the smallest number of rectangles