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Mirrors > Home > MPE Home > Th. List > pm4.81 | Unicode version |
Description: Theorem *4.81 of [WhiteheadRussell] p. 122. (Contributed by NM, 3-Jan-2005.) |
Ref | Expression |
---|---|
pm4.81 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.18 104 |
. 2
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2 | pm2.24 103 |
. 2
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3 | 1, 2 | impbii 181 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |
This theorem depends on definitions: df-bi 178 |
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