[obm-l] Somatorio

To: obm-l@xxxxxxxxxxxxxx
Subject: [obm-l] Somatorio
From: Paulo Henrique Souza Lima <pauloh_lima@xxxxxxxxxxxx>
Date: Wed, 25 Jul 2007 14:39:30 -0700 (PDT)
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Gostaria de saber se existe e qual é a forma fechada, para todo k, de:

\sum j>k \binom{j}{k} z^j , 0<z<1

Obrigado,
Paulo

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