Topologies on spaces of linear maps: Difference between revisions

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Note in particular that this is the case if {{math|𝒢}} consists of [[Bounded set (topological vector space)|(von-Neumann) bounded]] subsets of {{mvar|X}}.
 
=== Assumptions on {{math|𝒢}} ===
 
;Assumptions that guarantee a vector topology
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Some authors (e.g. Narici) require that {{math|𝒢}} satisfy the following condition, which implies, in particular, that {{math|𝒢}} is [[Directed set|directed]] by subset inclusion:
:{{math|𝒢}} is assumed to be closed with respect to the formation of subsets of finite unions of sets in {{math|𝒢}} (i.e. every subset of every finite union of sets in {{math|𝒢}} belongs to {{math|𝒢}}).
 
 
Some authors (e.g. Trèves) require that {{math|𝒢}} be directed under subset inclusion and that it satisfy the following condition: