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ex/natsum.thy~
author clasohm
Wed, 02 Nov 1994 11:50:09 +0100
changeset 156 fd1be45b64bf
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permissions -rw-r--r--
added IOA to isabelle/HOL
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(*  Title: 	HOL/ex/sum.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













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*)













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NatSum = Arith +













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consts sum :: "[nat=>nat, nat] => nat"













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rules  sum_0   "sum(f,0) = 0"













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       sum_Suc "sum(f,Suc(n)) = f(n) + sum(f,n)"













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end















Old_HOL