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[SPAM] [obm-l] prova de impossibilidade

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This is a multi-part message in MIME format.

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	charset="iso-8859-1"
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Ol=E1,


Gostaria de saber se algu=E9m conhece algum problema como exemplo em que =
se prova ser imposs=EDvel a uma certa s=E9rie possuir uma f=F3rmula =
fechada, ou de recorr=EAncia.

Exemplo: eu estava tentando achar uma f=F3rmula de recorr=EAncia para um =
produto que o colega Albert colocou aqui na lista:

P =3D (1 + 1^2)(1 + 2^2)(1 + 3^2)...(1 + n^2)

E imaginei que se caso este produto n=E3o possua uma f=F3rmula fechada =
eu poderia prov=E1-lo, ao inv=E9s de continuar com as tentativas de =
achar a f=F3rmula.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2900.2722" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Ol=E1,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Gostaria de saber se algu=E9m conhece =
algum problema=20
como exemplo em que se prova ser imposs=EDvel a uma certa s=E9rie =
possuir uma=20
f=F3rmula fechada, ou de recorr=EAncia.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Exemplo: eu estava tentando achar uma =
f=F3rmula de=20
recorr=EAncia para um produto que o colega Albert colocou aqui na=20
lista:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>P =3D (1 + 1^2)(1 + 2^2)(1 + 3^2)...(1 =
+=20
n^2)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>E imaginei que se caso este produto =
n=E3o possua uma=20
f=F3rmula fechada eu poderia prov=E1-lo, ao inv=E9s de continuar com as =
tentativas de=20
achar a f=F3rmula.</FONT></DIV></BODY></HTML>

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