A characterization ofH-closed Urysohn spaces

Autor:	Larry L. Herrington, Paul E. Long
Rok vydání:	1976
Předmět:	Urysohn's lemma Pure mathematics General Mathematics Algebra over a field Characterization (mathematics) Topological space Arithmetic Normal space Mathematics
Zdroj:	Rendiconti del Circolo Matematico di Palermo. 25:158-160
ISSN:	1973-4409 0009-725X
DOI:	10.1007/bf02849569
Popis:	The graphG(f) off:X→y is defined to be *-closed if for each (x, y)∋G(f) there exist open setsU andV containingx andy, respectively, such thatU×Int (cl(V))=0. A characterization ofH-closed Urysohn spaces is obtained using functions with *-closed graphs.
Databáze:	OpenAIRE
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