Nuprl - Proof: nsub inj factorial tail 1 1 2 1 1

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At: nsub inj factorial tail 1 1 2 1 1

1. a :

a1:

. a1<a

(

. (

a1 inj

b) ~

(b!a1))
3. b :

4. a

b
5.

a = 0

(

(a-1) inj

(b-1))) ~

(b-1)!(a-1))

By:	Rewrite by Hyp:2

Generated subgoal:

1 (b((b-1)!(a-1))) ~ (b(b-1)!(a-1))
2 steps

About:

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