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At:
sum constant n:, a:. sum(a | x < n) = an
By:
SumInd
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About:
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
n:
, a:
. sum(a | x < n) = a
n
