mb nat Sections MarkB generic Doc
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TheoremName
Thm* n:f:(n), m:n.
Thm* sum(f(x) | x < n) = f(m)+sum(if x=m 0 else f(x) fi | x < n)
[isolate_summand]
cites the following:
Thm* n:f,g:(n).
Thm* (i:nf(i) = g(i))  sum(f(x) | x < n) = sum(g(x) | x < n)
[sum_functionality]
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mb nat Sections MarkB generic Doc