On monotonous separately continuous functions

Author:

Grushka Yaroslav I.

Abstract

<p>Let T = (<strong>T</strong>, ≤) and T<sub>1</sub>= (<strong>T</strong><sub>1</sub> , ≤<sub>1</sub>) be linearly ordered sets and X be a topological space.  The main result of the paper is the following: If function ƒ(t,x) : <strong>T</strong> × X → <strong>T</strong><sub>1 </sub>is continuous in each  variable (“t” and  “x”)  separately  and  function ƒ<sub>x</sub>(t)  = ƒ(t,x) is  monotonous  on <strong>T</strong> for  every x ∈ X,  then ƒ is  continuous  mapping  from<strong> T</strong> × X to <strong>T</strong><sub>1</sub>,  where <strong>T</strong> and <strong>T</strong><sub>1</sub> are  considered  as  topological  spaces  under  the order topology and <strong>T</strong> × X is considered as topological space under the Tychonoff topology on the Cartesian  product of topological spaces <strong>T</strong> and X.</p>

Publisher

Universitat Politecnica de Valencia

Subject

Geometry and Topology

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