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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