On $\Delta$-metrizable spaces
Matematičeskie zametki, Tome 13 (1973) no. 2, pp. 277-287
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The problem about the necessity of the Doichinov–Nedev condition for the $\Delta$-metrizability of a topological space and the Stoltenberg problem, whether every Moore space is $\Delta$-metrizable, has negative solutions in the class of completely regular topological spaces.
@article{MZM_1973_13_2_a12,
author = {Ya. A. Kofner},
title = {On $\Delta$-metrizable spaces},
journal = {Matemati\v{c}eskie zametki},
pages = {277--287},
year = {1973},
volume = {13},
number = {2},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_2_a12/}
}
Ya. A. Kofner. On $\Delta$-metrizable spaces. Matematičeskie zametki, Tome 13 (1973) no. 2, pp. 277-287. http://geodesic.mathdoc.fr/item/MZM_1973_13_2_a12/