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12o<br />

S, = 2Mí = IZt (8'i + t"i + ...)­ S («1 *'i + £ 'i s "< + <strong>•</strong> ­)<br />

d'onde se tira<br />

­S?,«,— 2 (eix'i + 8'iS"i+ ■<strong>•</strong><strong>•</strong>),<br />

|.S ­ S| = |2 («, s'; + s'; i», + <strong>•</strong> <strong>•</strong> ­)l< íS *.<br />

„/ c'<br />

chamando s a maior das quantidades *v H, <strong>•</strong> <strong>•</strong><strong>•</strong>> E n e s> <strong>•</strong><strong>•</strong><strong>•</strong>»<br />

'Quando íj, «,, etc. tendem simultaneamente para zero, s<br />

tende para zero; logo S e £, tendem para um mesmo limite.<br />

Demonstra­se do mesmo'modo que $, e i

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