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Scuola pitagorica e Eleati.pdf

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La serie di Grandi (1671-1742) (1671 1742) …<br />

Quanto vale la seguente somma infinita?<br />

1 –1 + 1 –1 + 1 –1 + …<br />

a) ( 1 – 1 ) + ( 1 – 1 ) + ( 1 – 1 ) + … = 0<br />

b) 1 – ( 1 – 1 ) + ( 1 – 1 ) + ( 1 – 1 ) + … = 1<br />

Ma, ancora, se S denota la somma della serie:<br />

S = 1 – ( 1 – 1 + 1 – 1 + 1 – 1 + … ) = 1 – S<br />

da cui:<br />

c) S = 1/2

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