pm4.65r - Intuitionistic Logic Explorer

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Theorem pm4.65r 688

Description: One direction of Theorem *4.65 of [WhiteheadRussell] p. 120. The converse holds in classical logic. (Contributed by Jim Kingdon, 28-Jul-2018.)

**Assertion**
Ref	Expression
pm4.65r	$/\$

**Proof of Theorem pm4.65r**
Step	Hyp	Ref	Expression
1		annimim 687	1 $/\$

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $/\$ wa 104

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-in1 615 ax-in2 616

This theorem is referenced by: (None)

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