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Date: 15-5-2021
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Date: 4-8-2021
1434
Date: 13-6-2021
1762
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A topology on a set whose open sets are the unions of open balls
where is a pseudometric on , is any point of , and .
There is a remarkable difference between a metric and a pseudometric topology. The former is always , whereas the latter is, in general, not even . In fact, a pseudometric allows for some distinct points and , and then every open ball containing contains and conversely, so that no open set can separate the two points.
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المجمع العلمي ينظّم ندوة حوارية حول مفهوم العولمة الرقمية في بابل
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