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| Description: The converse of a restriction of a function. |
| Ref | Expression |
|---|---|
| fcnvres |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | visset 1816 |
. . . . . . . . 9
| |
| 2 | 1 | opelf 3646 |
. . . . . . . 8
|
| 3 | 2 | pm3.26d 321 |
. . . . . . 7
|
| 4 | 3 | ex 373 |
. . . . . 6
|
| 5 | pm4.71 637 |
. . . . . 6
| |
| 6 | 4, 5 | sylib 198 |
. . . . 5
|
| 7 | visset 1816 |
. . . . . . 7
| |
| 8 | 1, 7 | opelcnv 3304 |
. . . . . 6
|
| 9 | 1 | opelres 3378 |
. . . . . 6
|
| 10 | 8, 9 | bitr 173 |
. . . . 5
|
| 11 | 6, 10 | syl6bbr 540 |
. . . 4
|
| 12 | 2 | pm3.27d 325 |
. . . . . . 7
|
| 13 | 12 | ex 373 |
. . . . . 6
|
| 14 | pm4.71 637 |
. . . . . 6
| |
| 15 | 13, 14 | sylib 198 |
. . . . 5
|
| 16 | 7 | opelres 3378 |
. . . . . 6
|
| 17 | 1, 7 | opelcnv 3304 |
. . . . . . 7
|
| 18 | 17 | anbi1i 483 |
. . . . . 6
|
| 19 | 16, 18 | bitr 173 |
. . . . 5
|
| 20 | 15, 19 | syl6bbr 540 |
. . . 4
|
| 21 | 11, 20 | bitr3d 532 |
. . 3
|
| 22 | 21 | 19.21aivv 1289 |
. 2
|
| 23 | relcnv 3441 |
. . 3
| |
| 24 | relres 3393 |
. . 3
| |
| 25 | eqrel 3256 |
. . 3
| |
| 26 | 23, 24, 25 | mp2an 699 |
. 2
|
| 27 | 22, 26 | sylibr 200 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-br 2625 df-opab 2672 df-xp 3190 df-rel 3191 df-cnv 3192 df-dm 3194 df-rn 3195 df-res 3196 df-fun 3198 df-fn 3199 df-f 3200 |