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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 375 exp4a 378 anass 439 pm5.6 688 nan 689 2sb6 1336 2sb6rf 1339 2exsb 1351 mo 1393 eu2 1396 moanim 1427 2mo 1447 2eu6 1454 r2al 1676 r3al 1690 r19.23v 1741 reu2 1930 reu6 1932 rmo4 1933 rabss 2124 inssdif0 2333 unissb 2528 elintrab 2545 dfiin2 2588 iunss 2591 dftr5 2683 axrep5 2698 ordunisuc2 3115 dfom2 3133 asymref2 3440 fununi 3563 f1fv 3874 oaabs 4252 aceq1 4729 iscard2 4854 suppsr3 5224 infm3 6054 infmsup 6068 primet 6195 zmin 6219 ralrp 6289 raluz 6442 raluz2 6443 nnwos 6460 cau4i 6918 cau5 6919 cvg2 6922 cvg3 6923 facwordit 6944 clm4 7080 caucvg 7163 tgss3t 7638 islp2 7747 cncnplem3 7776 cncfmet 7905 metcnp4 7970 metcn4 7971 nmobndseqi 8440 grothprim 8783 chsscm 9112 chcmh 9113 h1det 9473 mdsl1 10248 mdsl2 10249 elat2 10267 |
| 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 |