Geodesic
A Non-Standard Characterization of Perfect Mappings
Canadian journal of mathematics, Tome 28 (1976) no. 6, pp. 1277-1279

Voir la notice de l'article provenant de la source Cambridge University Press

The central theorem of this note was proposed to me by I. Juhâsz on a napkin in Canter's restaurant in Pittsburgh, Pennsylvania. We agreed that if the proposition could be proven it would have some elegant applications and although it required a slight change before it could be proven, hopefully those expectations will be realized in this note. 
Button, Robert Warren. A Non-Standard Characterization of Perfect Mappings. Canadian journal of mathematics, Tome 28 (1976) no. 6, pp. 1277-1279. doi: 10.4153/CJM-1976-126-2
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[3] 3. Machover, M. and Hirschfeld, J., Lectures on non-standard analysis, Lecture Notes in Mathematics 94 (Springer-Verlag, Berlin, 1969). Google Scholar

[4] 4. Robinson, A., Non-standard analysis, studies in logic and the foundations of mathematics (North-Holland Publishing Co., Amsterdam, 1966). Google Scholar

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