IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
sum difference1 1. n : 2. f : n 3. g : n 4. d : 5. sum(f(x)-g(x) | x < n) = d sum(f(x) | x < n) = sum(g(x) | x < n)+sum(f(x)-g(x) | x < n)
By:
RWO
Thm*n:, f,g:(n).
Thm* sum(f(x) | x < n)+sum(g(x) | x < n) = sum(f(x)+g(x) | x < n)
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