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Mirrors > Home > ILE Home > Th. List > orbi1i | Unicode version |
Description: Inference adding a right disjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
orbi2i.1 |
Ref | Expression |
---|---|
orbi1i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orcom 723 | . 2 | |
2 | orbi2i.1 | . . 3 | |
3 | 2 | orbi2i 757 | . 2 |
4 | orcom 723 | . 2 | |
5 | 1, 3, 4 | 3bitri 205 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wo 703 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 704 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: orbi12i 759 orordi 768 dcan 928 3or6 1318 19.45 1676 sbequilem 1831 unass 3284 frecsuc 6384 elznn0nn 9215 |
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