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• 20:13, 19 January 2021 Richard Pinch talk contribs created page Sierpinski metric (Created page with "{{TEX|done}}{{MSC|54E35}} A metric on a countably infinite set $X = \{x_1,x_2,\ldots\}$. For $i \ne j$ define $d(x_i,x_j) = 1 + 1/(i+j)$, and $d(x_i,x_i) = 0$. The Sier...")