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Mirrors > Home > ILE Home > Th. List > pm4.65r | Unicode version |
Description: One direction of Theorem *4.65 of [WhiteheadRussell] p. 120. The converse holds in classical logic. (Contributed by Jim Kingdon, 28-Jul-2018.) |
Ref | Expression |
---|---|
pm4.65r |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | annimim 686 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-in1 614 ax-in2 615 |
This theorem is referenced by: (None) |
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