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Aihuxp.131 net.math utzoo!decvax!harpo!eagle!mhtsa!ihnss!ihuxp!grg Wed May 5 15:05:27 1982 2=1 d/dx( sum from 1 to x of f(x) ) != sum from 1 to x of f'(x).

You forgot to differentiate the limits of the integral (sum) !

Greg Guthrie Bell Labs Naperville, Ill (312)979-7303

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