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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 589 bibi2i 606 pm5.32 642 pm5.6 686 nan 687 nicodraw 949 19.35 1071 19.36 1074 sban 1232 2sb6 1331 2sb6rf 1334 eu1 1385 moabs 1408 moanim 1420 2eu6 1447 r2al 1668 r19.21t 1707 r19.35 1751 ralcom2 1768 reu2 1920 reu8 1926 ssconb 2160 reldisj 2303 inssdif0 2323 ssundif 2334 pwpw0 2460 unissb 2518 dfiin2 2578 ssiun 2582 ssiin 2589 axrep1 2684 dffr2 2909 dfepfr 2922 dffr3 3415 asymref2 3424 asymref2OLD 3426 fun11 3548 f1fv 3859 inf2 4580 axinf2 4596 aceq1 4701 aceq0 4702 axac 4717 ac6n 4729 kmlem14 4750 aceqkm 4753 zfcndrep 4938 zfcndac 4943 primet 6142 raluz2 6375 cau3ir 6852 clm1 7015 climshft 7041 climres 7042 caucvg 7099 islp2 7688 sncld 7726 lmbr2 7867 iscau2 7875 metcnp4 7904 bcthlem7 7939 nmobndseqi 8372 axgroth4 8719 grothprim 8722 cvnbtwn3t 10125 elat2 10175 anidmdbi 10334 |
| 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 |