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| Description: Import-export theorem. Part of Theorem *4.87 of [WhiteheadRussell] p. 122. |
| Ref | Expression |
|---|---|
| impexp |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-an 225 |
. . 3
| |
| 2 | 1 | imbi1i 186 |
. 2
|
| 3 | expt 142 |
. . 3
| |
| 4 | impt 141 |
. . 3
| |
| 5 | 3, 4 | impbi 157 |
. 2
|
| 6 | 2, 5 | bitr 173 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: pm3.3 348 pm3.31 349 imp 350 pm4.14 352 pm4.15 353 pm4.78 354 pm4.87 356 imp3a 361 imp4a 364 ex 373 exp3a 376 exp4a 380 anass 441 pm5.6 690 nan 691 2sb6 1338 2sb6rf 1341 2exsb 1353 mo 1395 eu2 1398 moanim 1429 2mo 1450 2eu6 1457 r2al 1679 r3al 1693 r19.23v 1744 reu2 1933 reu6 1935 rmo4 1936 rabss 2127 inssdif0 2337 unissb 2532 elintrab 2549 dfiin2 2592 iunss 2595 dftr5 2688 axrep5 2703 ordunisuc2 3121 dfom2 3139 asymref2 3446 fununi 3569 f1fv 3880 oaabs 4258 aceq1 4739 iscard2 4865 suppsr3 5236 infm3 6056 infmsup 6070 primet 6197 zmin 6221 ralrp 6290 raluz 6443 raluz2 6444 nnwos 6461 cau4i 6918 cau5 6919 cvg2 6922 cvg3 6923 facwordit 6944 clm4 7080 caucvg 7163 tgss3t 7637 islp2 7744 cncnplem3 7773 cncfmet 7902 metcnp4 7967 metcn4 7968 nmobndseqi 8436 grothprim 8778 chsscm 9107 chcmh 9108 h1det 9468 mdsl1 10243 mdsl2 10244 elat2 10262 |
| 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 df-an 225 |