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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 707 | . . 3 |
4 | bi3d.3 | . . 3 | |
5 | 3, 4 | orbi12d 707 | . 2 |
6 | df-3or 886 | . 2 | |
7 | df-3or 886 | . 2 | |
8 | 5, 6, 7 | 3bitr4g 212 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 98 wo 629 w3o 884 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 |
This theorem depends on definitions: df-bi 110 df-3or 886 |
This theorem is referenced by: ordtriexmid 4247 wetriext 4301 nntri3or 6072 ltsopi 6418 pitri3or 6420 nqtri3or 6494 elz 8247 ztri3or 8288 qtri3or 9098 |
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