Question #116435
Prove or disprove any metric defined on X(#0) induces a topology on X
1
Expert's answer
2020-05-24T15:55:59-0400

Every metric space is a topological space in a natural manner.

The metric topology is the topology on (X,d)(X,d) generated by the base Br(x)={yX ⁣:d(x,y)<r}B_r(x)=\{y\in X\colon d(x,y)<r\} (open balls). It is base because

  1. Union of Br(x)B_r(x) cover XX (obviously)
  2. xBr1(x1)Br2(x2)x\in B_{r_1}(x_1)\cap B_{r_2}(x_2) then xBr(x)Br1(x1)Br2(x2)x\in B_r(x) \subset B_{r_1}(x_1)\cap B_{r_2}(x_2) with r=min{r1d(x,x1),r2d(x,x2)}r=\min\{r_1-d(x,x_1),r_2-d(x,x_2)\}

A base generates a topology on XX that has, as open sets, all unions of elements of a base.


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