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Mirrors > Home > ILE Home > Th. List > bibi2i | Unicode version |
Description: Inference adding a biconditional to the left in an equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 7-May-2011.) (Proof shortened by Wolf Lammen, 16-May-2013.) |
Ref | Expression |
---|---|
bibi.a |
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Ref | Expression |
---|---|
bibi2i |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 |
. . 3
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2 | bibi.a |
. . 3
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3 | 1, 2 | bitrdi 196 |
. 2
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4 | id 19 |
. . 3
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5 | 4, 2 | bitr4di 198 |
. 2
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6 | 3, 5 | impbii 126 |
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 106 ax-ia2 107 ax-ia3 108 |
This theorem depends on definitions: df-bi 117 |
This theorem is referenced by: bibi1i 228 bibi12i 229 bibi2d 232 pm4.71r 390 sblbis 1960 sbrbif 1962 abeq2 2286 abid2f 2345 necon4biddc 2422 pm13.183 2875 disj3 3475 euabsn2 3661 a9evsep 4125 inex1 4137 zfpair2 4210 sucel 4410 bdinex1 14621 bj-zfpair2 14632 bj-d0clsepcl 14647 |
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