Nuprl - Proof: int ooc nat 1 2 1

(27steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc

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At: int ooc nat 1 2 1

1. f :

2.

i:

. 0

i

f(i) = i

2
3.

i:

.

0

i

f(i) = (-i)

2-1
4.

x,y:

. x

2

y

2-1

Bij(

;

; f)

By:

Analyze

Generated subgoals:

1 Inj(; ; f)
8 steps

2 Surj(; ; f)
7 steps

About:

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

(27steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc