{"version":"1.0","type":"link","title":"Preclosure operator - Newikis","description":"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.","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}