Nuprl Basics - Proof: sfa doc sexpr size wf 1 1 1 1

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At: sfa doc sexpr size wf 1 1 1 1

1. A : Type
2. Q : Sexpr(A)

Prop
3.

s:{s:Sexpr(A)| Q(s) }. Size(s)

4. x1 : {s:Sexpr(A)| Q(s) }
5. x2 : {s:Sexpr(A)| Q(s) }

Size(x1)+Size(x2)

By:	BackThru: a,b:. a+b THENW BackThru: Hyp:3

Generated subgoals:

None

About:

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