Nuprl Lemma : iff_wf
12,41
postcript
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A
,
B
:
. (
A
B
)
latex
ProofTree
Definitions
P
Q
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P
Q
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Q
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t
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x
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A
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B
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Lemmas
rev
implies
wf
origin
A, B:
. (A 
B) 
A, B:. (A B)
Q Q Q Tx:A. B(x)