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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 pm5.6 687 nan 688 2sb6 1334 2sb6rf 1337 2exsb 1349 mo 1391 eu2 1394 moanim 1425 2mo 1445 2eu6 1452 r2al 1673 r3al 1687 r19.23v 1738 reu2 1926 reu6 1928 rmo4 1929 rabss 2120 inssdif0 2329 unissb 2523 elintrab 2540 dfiin2 2583 iunss 2586 dftr5 2678 axrep5 2693 ordunisuc2 3110 dfom2 3128 asymref2 3432 fununi 3555 f1fv 3865 oaabs 4242 aceq1 4709 iscard2 4834 suppsr3 5204 infm3 6009 infmsup 6023 primet 6150 zmin 6175 ralrp 6234 raluz 6382 raluz2 6383 nnwos 6400 cau4i 6863 cau5 6864 cvg2 6867 cvg3 6868 facwordit 6889 clm4 7026 caucvg 7107 tgss3t 7588 islp2 7697 cncnplem3 7726 cncfmet 7857 metcnp4 7920 metcn4 7921 nmobndseqi 8385 grothprim 8722 chsscm 9051 chcmh 9052 h1det 9411 mdsl1 10185 mdsl2 10186 elat2 10204 |
| 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 |