Entry
Value
Name
CROSS
Conclusion
!s t. s CROSS t = {x,y | x IN s /\ y IN t}
Constructive Proof
Yes
Axiom
N|A
Classical Lemmas
N|A
Constructive Lemmas
T
T <=> (\p. p) = (\p. p)
(/\) = (\p q. (\f. f p q) = (\f. f T T))
(==>) = (\p q. p /\ q <=> p)
(!) = (\p. p = (\x. T))
Contained Package
set-def
Comment
Standard HOL library retrieved from OpenTheory
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