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[obm-l] Combinatoria e |Desordens

To: obm-l@xxxxxxxxxxxxxx
Subject: [obm-l] Combinatoria e |Desordens
From: Johann Peter Gustav Lejeune Dirichlet <peterdirichlet2002@xxxxxxxxxxxx>
Date: Tue, 22 Apr 2003 20:02:25 -0300 (ART)
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Oi genten!!!!E ai,se alguem manja de permutaçao caotica(sem pontos fixos) de (1,2,3,...,n),se chamarmos K_n o numero de jeitos de permutar caoticamente,sera que da pra demonstrar COMBINATRORIALMENTE que

K_n=n*K_(n-1)+(-1)^n?

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