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| Description: The converse of a restriction of a function. |
| Ref | Expression |
|---|---|
| fcnvres |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | visset 1350 |
. . . . . . . . 9
| |
| 2 | 1 | opelf 2762 |
. . . . . . . 8
|
| 3 | 2 | pm3.26d 258 |
. . . . . . 7
|
| 4 | 3 | exp 291 |
. . . . . 6
|
| 5 | pm4.71 481 |
. . . . . 6
| |
| 6 | 4, 5 | sylib 173 |
. . . . 5
|
| 7 | visset 1350 |
. . . . . . 7
| |
| 8 | 1, 7 | opelcnv 2518 |
. . . . . 6
|
| 9 | 1 | opelres 2579 |
. . . . . 6
|
| 10 | 8, 9 | bitr 151 |
. . . . 5
|
| 11 | 6, 10 | syl6bbr 416 |
. . . 4
|
| 12 | 2 | pm3.27d 262 |
. . . . . . 7
|
| 13 | 12 | exp 291 |
. . . . . 6
|
| 14 | pm4.71 481 |
. . . . . 6
| |
| 15 | 13, 14 | sylib 173 |
. . . . 5
|
| 16 | 7 | opelres 2579 |
. . . . . 6
|
| 17 | 1, 7 | opelcnv 2518 |
. . . . . . 7
|
| 18 | 17 | anbi1i 368 |
. . . . . 6
|
| 19 | 16, 18 | bitr 151 |
. . . . 5
|
| 20 | 15, 19 | syl6bbr 416 |
. . . 4
|
| 21 | 11, 20 | bitr3d 408 |
. . 3
|
| 22 | 21 | 19.21aivv 944 |
. 2
|
| 23 | relcnv 2624 |
. . 3
| |
| 24 | relres 2591 |
. . 3
| |
| 25 | cleqrel 2483 |
. . 3
| |
| 26 | 23, 24, 25 | mp2an 520 |
. 2
|
| 27 | 22, 26 | sylibr 175 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-xp 2424 df-rel 2425 df-cnv 2426 df-dm 2428 df-rn 2429 df-res 2430 df-fun 2432 df-fn 2433 df-f 2434 |