Nuprl - Proof: nsub inj factorial tail 1

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At: nsub inj factorial tail 1

1. a :

a1:

. a1<a

(

. (

a1 inj

b) ~

(b!a1))
3. b :

(

a inj

b) ~

(b!a)

By:	Decide: ab

Generated subgoals:

1 4. ab
(a inj b) ~ (b!a)
11 steps

2 4. ab
(a inj b) ~ (b!a)
4 steps

About:

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1	4. ab (a inj b) ~ (b!a)	11 steps
2	4. ab (a inj b) ~ (b!a)	4 steps