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Mirrors > Home > ILE Home > Th. List > 3anbi1i | Unicode version |
Description: Inference adding two conjuncts to each side of a biconditional. (Contributed by NM, 8-Sep-2006.) |
Ref | Expression |
---|---|
3anbi1i.1 |
Ref | Expression |
---|---|
3anbi1i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3anbi1i.1 | . 2 | |
2 | biid 169 | . 2 | |
3 | biid 169 | . 2 | |
4 | 1, 2, 3 | 3anbi123i 1127 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 103 w3a 919 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 df-3an 921 |
This theorem is referenced by: fzolb 9162 |
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