Abstract
A single valued function D(x, y) is a metric for a topological space provided
that for points x, y, z of the space:
1. the equality
holding if and only if x = y,
2.
(symmetry),
3. (triangle
inequality),
4. x belongs to the closure of the set M if and only if P(x, m) (m element of
M) is not bounded from 0 (preserves limit points).
Publisher
Canadian Mathematical Society
Cited by
386 articles.
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