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| Description: Introduce an antecedent to both sides of a logical equivalence. |
| Ref | Expression |
|---|---|
| bi.a |
|
| Ref | Expression |
|---|---|
| imbi2i |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bi.a |
. . . 4
| |
| 2 | 1 | biimp 151 |
. . 3
|
| 3 | 2 | imim2i 17 |
. 2
|
| 4 | 1 | biimpr 152 |
. . 3
|
| 5 | 4 | imim2i 17 |
. 2
|
| 6 | 3, 5 | impbi 157 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: imbi12i 188 iman 237 orbi2i 255 or12 258 pm4.14 352 pm4.15 353 pm4.78 354 pm4.79 355 anass 439 ibibr 590 bibi2i 607 pm5.32 643 pm5.6 687 nan 688 nicodraw 951 19.35 1074 19.36 1077 sban 1236 2sb6 1335 2sb6rf 1338 eu1 1391 moabs 1414 moanim 1426 2eu6 1453 r2al 1674 r19.21t 1713 r19.35 1757 ralcom2 1774 reu2 1927 reu8 1933 ssconb 2167 reldisj 2310 inssdif0 2330 ssundif 2341 pwpw0 2466 unissb 2524 dfiin2 2584 ssiun 2588 ssiin 2595 axrep1 2690 dffr2 2915 dfepfr 2928 dffr3 3427 asymref2 3436 fun11 3558 f1fv 3869 inf2 4591 axinf2 4607 aceq1 4712 aceq0 4713 axac 4728 ac6n 4740 kmlem14 4761 aceqkm 4764 zfcndrep 4949 zfcndac 4954 primet 6152 raluz2 6388 cau3ir 6867 clm1 7030 climshft 7057 climres 7058 caucvg 7116 islp2 7707 sncld 7747 lmbr2 7891 iscau2 7899 metcnp4 7932 bcthlem7 7967 nmobndseqi 8400 axgroth4 8735 grothprim 8738 cvnbtwn3t 10171 elat2 10223 anidmdbi 10392 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 |
| This theorem depends on definitions: df-bi 147 |