P.S. Unless you are talking about finding a map you cannot color with 4 colors... in that case, yes, it is impossible.
@pablosoberon True... Most of my friends live in spheres. But I do have a friend from a closed universe that lives in a torus.
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@pablosoberon True... Most of my friends live in spheres. But I do have a friend from a closed universe that lives in a torus.