Geodesic
The functor σ²X
Studia Mathematica, Tome 116 (1995) no. 1, pp. 49-57

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

We disprove the existence of a universal object in several classes of spaces including the class of weakly Lindelöf Banach spaces.
DOI : 10.4064/sm-116-1-49-57

Stevo Todorčević 1

1 
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     title = {The functor {\ensuremath{\sigma}{\texttwosuperior}X}},
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Stevo Todorčević. The functor σ²X. Studia Mathematica, Tome 116 (1995) no. 1, pp. 49-57. doi: 10.4064/sm-116-1-49-57

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