Geodesic
A Contribution to the Theory of Metrization
Canadian journal of mathematics, Tome 29 (1977) no. 6, pp. 1145-1151

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

In a paper on the same subject [28] and another coming out at the same time [27], Nagata gave his celebrated Double (treble, really) Sequence Theorem, with which he deduced easily and thus brought together the basic metrization theorems, i.e. theorems in which the conditions for metrizability are given as the availability of bases or subbases of certain descriptions. 
Hung, H. H. A Contribution to the Theory of Metrization. Canadian journal of mathematics, Tome 29 (1977) no. 6, pp. 1145-1151. doi: 10.4153/CJM-1977-113-6
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