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Mirrors > Home > ILE Home > Th. List > 3orbi123d | Unicode version |
Description: Deduction joining 3 equivalences to form equivalence of disjunctions. (Contributed by NM, 20-Apr-1994.) |
Ref | Expression |
---|---|
bi3d.1 | |
bi3d.2 | |
bi3d.3 |
Ref | Expression |
---|---|
3orbi123d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi3d.1 | . . . 4 | |
2 | bi3d.2 | . . . 4 | |
3 | 1, 2 | orbi12d 782 | . . 3 |
4 | bi3d.3 | . . 3 | |
5 | 3, 4 | orbi12d 782 | . 2 |
6 | df-3or 963 | . 2 | |
7 | df-3or 963 | . 2 | |
8 | 5, 6, 7 | 3bitr4g 222 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wo 697 w3o 961 |
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 698 |
This theorem depends on definitions: df-bi 116 df-3or 963 |
This theorem is referenced by: ordtriexmid 4432 wetriext 4486 nntri3or 6382 tridc 6786 ltsopi 7121 pitri3or 7123 nqtri3or 7197 elz 9049 ztri3or 9090 qtri3or 10013 trilpo 13225 |
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