MathGroup Archive 1999

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Local Variables

I am most confused... Nested Sums seem to be able to
refer to their
predecessors' iterators as in: 
" Sum[DoSomething, {i, 1, whatever},{j,
     ]"... but:
"For[i = 1, i < whatever, i++,
	For[j = 1, j < someotherwhatever, j++,
	  Do Something[[i]][[j]]
   ]" doesn't.
What am I missing?
Thanks in advance.

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