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Preclosure operator
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Preclosure operator : ウィキペディア英語版
Preclosure operator
In topology, a preclosure operator, or Čech closure operator is a map between subsets of a set, similar to a topological closure operator, except that it is not required to be idempotent. That is, a preclosure operator obeys only three of the four Kuratowski closure axioms.
== Definition ==
A preclosure operator on a set X is a map ()_p
:()_p:\mathcal(X) \to \mathcal(X)
where \mathcal(X) is the power set of X.
The preclosure operator has to satisfy the following properties:
# ()_p = \varnothing \! (Preservation of nullary unions);
# A \subseteq ()_p (Extensivity);
# (\cup B )_p = ()_p \cup ()_p (Preservation of binary unions).
The last axiom implies the following:
: 4. A \subseteq B implies ()_p \subseteq ()_p.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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