changeset 63 | 94436622324d |
child 68 | acad709cad5d |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ex/natsum.thy Sun Mar 27 16:43:06 1994 +0200 @@ -0,0 +1,13 @@ +(* Title: HOL/ex/natsum.thy + ID: $Id$ + Author: Tobias Nipkow + Copyright 1994 TU Muenchen + +A summation operator. sum(f,n+1) is the sum of all f(i), i=0...n. +*) + +NatSum = Arith + +consts sum :: "[nat=>nat, nat] => nat" +rules sum_0 "sum(f,0) = 0" + sum_Suc "sum(f,Suc(n)) = f(n) + sum(f,n)" +end