食道
发表于 2025-3-23 12:36:31
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用肘
发表于 2025-3-23 16:46:30
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煤渣
发表于 2025-3-23 18:14:51
Conjectures and Counterexamplesint set topology. Alexandroff and Urysohn provided one solution as early as 1923 by imposing special conditions on a sequence of open conversing. Nearly ten years later R.L. Moore chose to begin his classic text on the Foundations of Point Set Theory with an axiom structure which was a slig
Decrepit
发表于 2025-3-23 23:14:23
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我的巨大
发表于 2025-3-24 04:14:34
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人类学家
发表于 2025-3-24 08:43:24
Technologietransfer und KulturkonfliktIt is often desirable for a topologist to be able to assign to a set of objects a topology about which he knows a great deal in advance. This can be done by stipulating that the topology must satisfy axioms in addition to those generally required of topological spaces.
使害怕
发表于 2025-3-24 12:39:04
Technologietransfer und KulturkonfliktConnectedness denies the existence of certain subsets of a topological space with the property that Ū ∩ . = ∅ and . ∩ . = ∅. Any two such subsets are said to be . in the space. Although this concept is logically related to the separation axioms, it examines the structure of topological spaces from the opposite point of view.
Congregate
发表于 2025-3-24 17:41:57
General IntroductionA . is a pair (.,τ) consisting of a set . and a collection τ of subsets of ., called ., satisfying the following axioms:.The collection τ is called a . for .. The topological space (.,τ) is sometimes referred to as the . . when it is clear which topology . carries.
嘲弄
发表于 2025-3-24 20:02:16
Separation AxiomsIt is often desirable for a topologist to be able to assign to a set of objects a topology about which he knows a great deal in advance. This can be done by stipulating that the topology must satisfy axioms in addition to those generally required of topological spaces.
Control-Group
发表于 2025-3-25 00:37:11
ConnectednessConnectedness denies the existence of certain subsets of a topological space with the property that Ū ∩ . = ∅ and . ∩ . = ∅. Any two such subsets are said to be . in the space. Although this concept is logically related to the separation axioms, it examines the structure of topological spaces from the opposite point of view.