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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 2128 inssdif0 2338 unissb 2533 elintrab 2550 dfiin2 2593 iunss 2596 dftr5 2689 axrep5 2704 ordunisuc2 3122 dfom2 3140 asymref2 3447 fununi 3570 f1fv 3881 oaabs 4259 aceq1 4746 iscard2 4872 suppsr3 5243 infm3 6063 infmsup 6077 primet 6204 zmin 6228 ralrp 6297 raluz 6450 raluz2 6451 nnwos 6468 cau4i 6925 cau5 6926 cvg2 6929 cvg3 6930 facwordit 6951 clm4 7087 caucvg 7170 tgss3t 7644 islp2 7751 cncnplem3 7780 cncfmet 7909 metcnp4 7974 metcn4 7975 nmobndseqi 8443 grothprim 8785 chsscm 9114 chcmh 9115 h1det 9475 mdsl1 10251 mdsl2 10252 elat2 10270 |
| 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 |