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src/ZF/ex/NatSum.thy
changeset 41777 1f7cbe39d425
parent 35762 af3ff2ba4c54
child 65449 c82e63b11b8b
equal deleted inserted replaced
41776:3bd83302a3c3 41777:1f7cbe39d425 
     1 (*  Title:      ZF/ex/Natsum.thy
 
     1 (*  Title:      ZF/ex/NatSum.thy
 
     2     Author:     Tobias Nipkow & Lawrence C Paulson
 
     2     Author:     Tobias Nipkow & Lawrence C Paulson
 
     3 
     3 
     4 A summation operator. sum(f,n+1) is the sum of all f(i), i=0...n.
 
     4 A summation operator. sum(f,n+1) is the sum of all f(i), i=0...n.
 
     5 
     5 
     6 Note: n is a natural number but the sum is an integer,
 
     6 Note: n is a natural number but the sum is an integer,
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