map such that is a cofinal subset of and The map is called [[order-preserving]] and an order homomorphism if whenever then The set being [[Cofinal (mathematics) in means that for every there exists some such that

If is a cluster point of some subnet of then is also a cluster point of

Ultranets

A net in set is called a {{visible anchor}} or an {{visible anchor}} if for every subset is eventually in or is eventually in the complement

Every

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