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Mirrors > Home > ILE Home > Th. List > bi2anan9r | Unicode version |
Description: Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 19-Feb-1996.) |
Ref | Expression |
---|---|
bi2an9.1 | |
bi2an9.2 |
Ref | Expression |
---|---|
bi2anan9r |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi2an9.1 | . . 3 | |
2 | bi2an9.2 | . . 3 | |
3 | 1, 2 | bi2anan9 538 | . 2 |
4 | 3 | ancoms 255 | 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: (None) |
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