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AutomataTheory
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At:
factorial
wf
1
2
1
1.
n:
2.
0 < n
3.
(n-1)!
4.
n = 0
(n-1)!
By:
Inst Thm*
n:
. n
[(n-1)! ]
Generated subgoals:
None
About:
n = 0
(n-1)! 
n:. n [(n-1)! ]
