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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 591 bibi2i 608 pm5.32 644 pm5.6 688 nan 689 nicodraw 952 19.35 1075 19.36 1078 sban 1237 2sb6 1336 2sb6rf 1339 eu1 1392 moabs 1415 moanim 1427 2eu6 1454 r2al 1676 r19.21t 1715 r19.35 1759 ralcom2 1776 reu2 1930 reu8 1936 ssconb 2170 reldisj 2313 inssdif0 2333 ssundif 2344 pwpw0 2469 pwsnALT 2501 unissb 2528 dfiin2 2588 ssiun 2592 ssiin 2599 axrep1 2694 dffr2 2919 dfepfr 2932 dffr3 3431 asymref2 3440 fun11 3562 f1fv 3874 inf2 4608 axinf2 4624 aceq1 4729 aceq0 4730 axac 4745 ac6n 4757 kmlem14 4778 aceqkm 4781 zfcndrep 4966 zfcndac 4971 primet 6195 raluz2 6443 cau3ir 6915 clm1 7077 climshft 7104 climres 7105 caucvg 7163 islp2 7747 sncld 7787 lmbr2 7929 iscau2 7937 metcnp4 7970 bcthlem7 8005 nmobndseqi 8440 axgroth4 8780 grothprim 8783 cvnbtwn3t 10215 elat2 10267 anidmdbi 10434 |
| 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 |