src/HOL/ex/NatSum.thy
author paulson
Wed, 08 Mar 2000 16:24:46 +0100
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(*  Title:      HOL/ex/natsum.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1994 TU Muenchen
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A summation operator. sum(f,n+1) is the sum of all f(i), i=0...n.
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*)
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NatSum = Main +
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consts sum     :: [nat=>nat, nat] => nat
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primrec 
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  "sum f 0 = 0"
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  "sum f (Suc n) = f(n) + sum f n"
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end