Nuprl - Proof: negnegelim imp notfin imp unb inf 1 2 1 1 1 1

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At: negnegelim imp notfin imp unb inf 1 2 1 1 1 1

1.

P:Prop.

P

P
2. A : Type
3.

(

n:

. A ~

n)
4. k :

5. 0<k
6. f :

(k-1)

A
7. Inj(

(k-1); A; f) [not for witness]
8.

a:A.

(

i:

(k-1). f(i)

a)

A ~

(k-1)

By:	BackThru: Thm* (f:(AB). Bij(A; B; f)) (B ~ A) THEN Witness: f

Generated subgoal:

1 Bij((k-1); A; f)
5 steps

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

(22steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc