Nuprl Lemma : iff_preserves_decidability
13,42
postcript
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A
,
B
:
. Dec(
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(
A
B
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Dec(
B
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Up
core
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core
2
Definitions
t
T
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Q
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Dec(
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P
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x
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B
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A
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P
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False
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Lemmas
not
wf
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iff
wf
origin
A, B:
. Dec(A) 
(A 
B) Dec(B) A, B:. Dec(A) (A B) Dec(B) 
T
Q Qx:A. B(x)
A Q Q