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Mirrors > Home > NFE Home > Th. List > 3anbi3i | 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 |
---|---|
3anbi3i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biid 227 | . 2 | |
2 | biid 227 | . 2 | |
3 | 3anbi1i.1 | . 2 | |
4 | 1, 2, 3 | 3anbi123i 1140 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wb 176 w3a 934 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 df-an 360 df-3an 936 |
This theorem is referenced by: sfin112 4529 dfsi2 4751 cnvsi 5518 |
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