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Mirrors > Home > NFE Home > Th. List > pm2.4 | Unicode version |
Description: Theorem *2.4 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.) |
Ref | Expression |
---|---|
pm2.4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 374 | . 2 | |
2 | id 19 | . 2 | |
3 | 1, 2 | jaoi 368 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wo 357 |
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 177 df-or 359 |
This theorem is referenced by: (None) |
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