countable space
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Second-countable space — In topology, a second countable space, also called a completely separable space, is a topological space satisfying the second axiom of countability. A space is said to be second countable if its topology has a countable base. More explicitly,… … Wikipedia
First-countable space — In topology, a branch of mathematics, a first countable space is a topological space satisfying the first axiom of countability . Specifically, a space, X , is said to be first countable if each point has a countable neighbourhood basis (local… … Wikipedia
Space-filling curve — 3 iterations of a Peano curve construction, whose limit is a space filling curve. In mathematical analysis, a space filling curve is a curve whose range contains the entire 2 dimensional unit square (or more generally an N dimensional hypercube) … Wikipedia
space — [speɪs] noun 1. [uncountable] the area or amount of room in a newspaper, magazine etc that is used for a particular subject ˈadvertising ˌspace [uncountable] MARKETING somewhere that advertising is placed or shown: • He hopes to make money by… … Financial and business terms
space bar — ˈspace bar noun [countable] COMPUTING the long key at the bottom of a computer keyboard that you press to make a space * * * space bar UK US (also spacebar) noun [C, usually singular] IT ► on a computer keyboard, the long bar below the letter … Financial and business terms
space — I UK [speɪs] / US noun Word forms space : singular space plural spaces *** 1) [countable/uncountable] an empty or available area We replaced the bath with a shower to create more space. Every space on the walls is covered with pictures. a… … English dictionary
Countable chain condition — See also: Forcing (set theory)#The countable chain condition In order theory, a partially ordered set X is said to satisfy the countable chain condition, or to be ccc, if every strong antichain in X is countable. There are really two conditions:… … Wikipedia
Countable tightness — In mathematics, a topological space X is said to have countable tightness if it satisfies the condition::Given any subset A subset X, if x in overline{A}, there is a countable subset B subset A such that x in overline{B}.A prototypical example of … Wikipedia
space bar — noun the bar shaped typewriter key that introduces spaces when used • Hypernyms: ↑key • Part Holonyms: ↑typewriter keyboard * * * noun 1. : a bar (as on a typewriter) that on each depression causes the carriage to move one space to the left 2. :… … Useful english dictionary
space probe — noun a rocket propelled guided missile that can escape the earth s atmosphere; makes observations of the solar system that cannot be made by terrestrial observation (Freq. 3) • Hypernyms: ↑guided missile • Part Meronyms: ↑telemeter * * *… … Useful english dictionary
space flight — noun : flight beyond the earth s atmosphere * * * space flight UK US noun [countable/uncountable] [singular space flight plural space flights] a journey into space Thesaurus … Useful english dictionary
