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Mirrors > Home > ILE Home > Th. List > pm5.1 | Unicode version |
Description: Two propositions are equivalent if they are both true. Theorem *5.1 of [WhiteheadRussell] p. 123. (Contributed by NM, 21-May-1994.) |
Ref | Expression |
---|---|
pm5.1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm5.501 233 | . 2 | |
2 | 1 | biimpa 280 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: pm5.35 826 ssconb 3076 |
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