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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 |
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Ref | Expression |
---|---|
orbi1i |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orcom 718 |
. 2
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2 | orbi2i.1 |
. . 3
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3 | 2 | orbi2i 752 |
. 2
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4 | orcom 718 |
. 2
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5 | 1, 3, 4 | 3bitri 205 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() |
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 699 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: orbi12i 754 orordi 763 dcan 919 3or6 1302 19.45 1662 sbequilem 1811 unass 3238 frecsuc 6312 elznn0nn 9092 |
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