Nuprl Basics - Proof: sfa doc factorial2 wf 1 1 2 1 1 2 2 2

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At: sfa doc factorial2 wf 1 1 2 1 1 2 2 2

1. x :

x1:

. x1<x

x1!

(given (x1 rem 2) = 0)
3. x

0
4. (x rem 2) = 0
5. (x rem 2) = 0
6. 2

x
7. (x-2)!

(given ((x-2) rem 2) = 0)

(x-2)!

By:	((x-2) rem 2) = 0 Asserted

Generated subgoals:

1 ((x-2) rem 2) = 0
1 step

2 8. ((x-2) rem 2) = 0
(x-2)!
1 step

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html