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Le degré de Lindelöf est |
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| Authors: | Ahmed Bouziad |
| Institution: | Département de Mathématiques, Université de Rouen, CNRS UPRES-A 6085, 76821 Mont Saint-Aignan, France |
| Abstract: | Two Tychonoff spaces  and  are said to be  -equivalent if  and  are linearly homeomorphic. It is shown that if  and  are  -equivalent, then the Lindelöf numbers of  and  are the same. The proof given is a strengthening of the one given by N.V. Velichko to show that the Lindelöf property is  -invariant. |
| Keywords: | Set-valued maps Lindel\"{o}f degree linear homeomorphism function spaces |
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