Lemma of Dehn
In Mathématiques the lemma of Dehn is a result of topology of the varieties of dimension three. It states that the existence of a Fonction refines per pieces of a Disque towards a Variété of dimension 3, whose singular points are in the interior of the disc, implies the existence of another function closely connected per pieces between these spaces, which is a Plongement and which is identical to original on the edges of the disc.
One thought this theorem shown by max Dehn in 1910, but an error was found in the demonstration by Hellmuth Kneser. The statute of the lemma of Dehn is remained dubious until 1956. It was proven on this date by Christos Papakyriakopoulos by using a clever construction containing Revêtement S.
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