Geodesic
The Notions of W-net and Y-compact Space Viewed Under Infinitesimal Microscope
Publications de l'Institut Mathématique, _N_S_34 (1983) no. 48, p. 243

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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 : 03H05 
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     author = {Rade \v{Z}ivaljevi\'c},
     title = {The {Notions} of {W-net} and {Y-compact} {Space} {Viewed} {Under} {Infinitesimal} {Microscope}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {243 },
     publisher = {mathdoc},
     volume = {_N_S_34},
     number = {48},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1983_N_S_34_48_a35/}
}
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Rade Živaljević. The Notions of W-net and Y-compact Space Viewed Under Infinitesimal Microscope. Publications de l'Institut Mathématique, _N_S_34 (1983) no. 48, p. 243 . http://geodesic.mathdoc.fr/item/PIM_1983_N_S_34_48_a35/