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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 223 |
. . 3
| |
| 2 | 1 | imbi1i 184 |
. 2
|
| 3 | expt 140 |
. . 3
| |
| 4 | impt 139 |
. . 3
| |
| 5 | 3, 4 | impbii 155 |
. 2
|
| 6 | 2, 5 | bitri 171 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: pm3.3 346 pm3.31 347 imp 348 pm4.14 350 pm4.15 351 pm4.78 352 pm4.87 354 imp3a 359 imp4a 362 ex 371 exp3a 374 exp4a 378 anass 441 pm5.6 692 nan 693 2sb6 1375 2sb6rf 1378 2exsb 1390 mo 1432 eu2 1435 moanim 1466 2mo 1487 2eu6 1494 r2al 1722 r3al 1736 r19.23v 1787 reu2 1976 reu6 1978 rmo4 1979 rabss 2176 inssdif0 2386 unissb 2595 elintrab 2612 dfiin2 2656 iunss 2659 dftr5 2757 axrep5 2772 ordunisuc2 3198 dfom2 3220 asymref2 3532 fununi 3668 dff13 3988 oaabs 4392 aceq1 4875 iscard2 5004 suppsr3 5378 ralrp 6205 infm3 6222 infmsup 6236 prime 6366 zmin 6391 raluz 6569 raluz2 6570 nnwos 6587 cau4ii 7121 cau5i 7122 cvg2i 7125 cvg3i 7126 facwordi 7147 clm4i 7283 caucvgi 7366 tgss3 7850 islp2 7957 cncnplem3 7986 cncfmet 8116 metcnp4 8181 metcn4 8182 nmobndseqi 8695 grothprim 9057 chsscmi 9388 chcmhi 9389 h1dei 9749 mdsl1i 10529 mdsl2i 10530 elat2 10548 elicc3 11410 cnfillim 11687 flimfcn 11715 fcluscn 11731 fclsfcn 11744 lmclim2 11915 lmtlm 11969 heiborlem16 12026 |
| 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 145 df-an 223 |