最終更新日:2022/12/24

If the square [0,1]⨯0,1 in ℝ² (with the standard topology) is mapped onto the set [0,1)⨯[0,1) with the quotient map f(x,y)=(⌊x⌋,⌊y⌋), then the target space (with its induced quotient topology) is topologically equivalent to a torus.

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