Nuprl - Proof: card split decbl 1 1

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At: card split decbl 1 1

1. A : Type
2. P : A

Prop
3.

x:A.

!i:

2. if i=

P(x) else

P(x) fi

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

P(x) })

By:	Rewrite by Thm* (A+B) ~ (i:2if i=0 A else B fi)

Generated subgoal:

1 A ~ (i:2if i=0 {x:A| P(x) } else {x:A| P(x) } fi)
4 steps

About:

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