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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 682 |
. 2
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2 | orbi2i.1 |
. . 3
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3 | 2 | orbi2i 714 |
. 2
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4 | orcom 682 |
. 2
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5 | 1, 3, 4 | 3bitri 204 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 665 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: orbi12i 716 orordi 725 dcan 880 3or6 1259 19.45 1618 sbequilem 1766 unass 3157 frecsuc 6172 elznn0nn 8764 |
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