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Published online by Cambridge University Press: 26 February 2010
J. E. Jayne and C. A. Rogers in [7] introduced the following notion.
Let X be a topological space and p be a metric defined on X × X. X is said to be fragmented by the metric p if, for every ε > 0 and each nonempty subset Y of X there is a nonempty relatively open subset U of Y such that ρ-diam (U)≤ ε.