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Mirrors > Home > NFE Home > Th. List > bibi1i | Unicode version |
Description: Inference adding a biconditional to the right in an equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bibi.a |
Ref | Expression |
---|---|
bibi1i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bicom 191 | . 2 | |
2 | bibi.a | . . 3 | |
3 | 2 | bibi2i 304 | . 2 |
4 | bicom 191 | . 2 | |
5 | 1, 3, 4 | 3bitri 262 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wb 176 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 |
This theorem is referenced by: bibi12i 306 biluk 899 xorass 1308 hadbi 1387 sbrbis 2073 ssequn1 3433 axssetprim 4092 |
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