bn:01848820n
Noun Concept
EL
καθολική κάλυψη  καθολική κάλυψη χώρου  μετασχηματισμού καταστρώματος
EN
In topology, a covering or covering projection is a surjective map between topological spaces that, intuitively, locally acts like a projection of multiple copies of a space onto itself. Wikipedia
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