Nuprl - Proof: card split decbl 1

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: card split decbl 1

1. A : Type
2. P : A

Prop
3.

x:A. Dec(P(x))

A ~ ({x:A| P(x) }+{x:A|

P(x) })

By:	Rewrite'-1 by Thm* Dec(P) (!i:2. if i=0 P else P fi)

Generated subgoal:

1 3. x:A. !i:2. if i=0 P(x) else P(x) fi
A ~ ({x:A| P(x) }+{x:A| P(x) })
5 steps

About:

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