Question Number 170683 by ArielVyny last updated on 29/May/22
$${l}'{union}\:{d}'{un}\:{ferme}\:{et}\:{d}'{un}\:{borne}\:{est}-{il} \\ $$$${compacte}?\:{quand}\:{est}-{il}\:{de}\:{l}'{intersection}. \\ $$
l-union-d-un-ferme-et-d-un-borne-est-il-compacte-quand-est-il-de-l-intersection-