PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 34(48), pp. 243246 (1983) 

THE NOTIONS OF $\bold w$NET AND YCOMPACT SPACE VIEWED UNDER INFINITESIMAL MICROSCOPERade \v Zivaljevi\'cMatematicki institut SANU, Beograd, YugoslaviaAbstract: Nonstandard analysis of A. Robinson is used to give a nonstandard description of the notion of $w$net introduced by H.J. Wu in [6]. This concept leads to the notion of $Y$compact space so that $[0,1]$compact spaces are compact in the usual sence while $R$compact spaces are E. Hewit's realcompact spaces. Classification (MSC2000): 03H05 Full text of the article:
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