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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 441 ibibr 593 bibi2i 610 pm5.32 646 pm5.6 690 nan 691 nicodraw 954 19.35 1077 19.36 1080 sban 1239 2sb6 1338 2sb6rf 1341 eu1 1394 moabs 1417 moanim 1429 2eu6 1457 r2al 1679 r19.21t 1718 r19.35 1762 ralcom2 1779 reu2 1933 reu8 1939 ssconb 2174 reldisj 2318 inssdif0 2338 ssundif 2349 pwpw0 2474 pwsnALT 2506 unissb 2533 dfiin2 2593 ssiun 2597 ssiin 2604 axrep1 2700 dffr2 2926 dfepfr 2939 dffr3 3438 asymref2 3447 fun11 3569 f1fv 3881 inf2 4624 axinf2 4640 aceq1 4746 aceq0 4747 axac 4762 ac6n 4774 kmlem14 4795 aceqkm 4798 zfcndrep 4985 zfcndac 4990 primet 6204 raluz2 6451 cau3ir 6922 clm1 7084 climshft 7111 climres 7112 caucvg 7170 islp2 7751 sncld 7791 lmbr2 7933 iscau2 7941 metcnp4 7974 bcthlem7 8009 nmobndseqi 8443 axgroth4 8782 grothprim 8785 cvnbtwn3t 10218 elat2 10270 anidmdbi 10437 |
| 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 |