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Related theorems Unicode version |
| Description: A subclass of the identity function is the identity function restricted to its domain. |
| Ref | Expression |
|---|---|
| iss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 2063 |
. . . . . . . 8
| |
| 2 | df-br 2620 |
. . . . . . . . 9
| |
| 3 | visset 1813 |
. . . . . . . . . 10
| |
| 4 | 3 | ideq 3277 |
. . . . . . . . 9
|
| 5 | 2, 4 | bitr3 175 |
. . . . . . . 8
|
| 6 | 1, 5 | syl6ib 212 |
. . . . . . 7
|
| 7 | 6 | pm4.71rd 639 |
. . . . . 6
|
| 8 | eqcom 1477 |
. . . . . . . . . . . . 13
| |
| 9 | 8 | anbi1i 481 |
. . . . . . . . . . . 12
|
| 10 | 7, 9 | syl6bb 536 |
. . . . . . . . . . 11
|
| 11 | 10 | exbidv 1279 |
. . . . . . . . . 10
|
| 12 | visset 1813 |
. . . . . . . . . . 11
| |
| 13 | opeq2 2488 |
. . . . . . . . . . . 12
| |
| 14 | 13 | eleq1d 1540 |
. . . . . . . . . . 11
|
| 15 | 12, 14 | ceqsexv 1835 |
. . . . . . . . . 10
|
| 16 | 11, 15 | syl6bb 536 |
. . . . . . . . 9
|
| 17 | 12 | eldm2 3308 |
. . . . . . . . 9
|
| 18 | 16, 17 | syl5bb 532 |
. . . . . . . 8
|
| 19 | 18 | anbi2d 616 |
. . . . . . 7
|
| 20 | opeq2 2488 |
. . . . . . . . 9
| |
| 21 | 20 | eleq1d 1540 |
. . . . . . . 8
|
| 22 | 21 | pm5.32i 645 |
. . . . . . 7
|
| 23 | 19, 22 | syl6bb 536 |
. . . . . 6
|
| 24 | 7, 23 | bitr4d 531 |
. . . . 5
|
| 25 | 3 | opelres 3372 |
. . . . . 6
|
| 26 | 5 | anbi1i 481 |
. . . . . 6
|
| 27 | 25, 26 | bitr2 174 |
. . . . 5
|
| 28 | 24, 27 | syl6bb 536 |
. . . 4
|
| 29 | 28 | 19.21aivv 1287 |
. . 3
|
| 30 | reli 3273 |
. . . . 5
| |
| 31 | relss 3246 |
. . . . 5
| |
| 32 | 30, 31 | mpi 44 |
. . . 4
|
| 33 | relres 3387 |
. . . . 5
| |
| 34 | eqrel 3250 |
. . . . 5
| |
| 35 | 33, 34 | mpan2 696 |
. . . 4
|
| 36 | 32, 35 | syl 10 |
. . 3
|
| 37 | 29, 36 | mpbird 196 |
. 2
|
| 38 | resss 3383 |
. . 3
| |
| 39 | sseq1 2082 |
. . 3
| |
| 40 | 38, 39 | mpbiri 194 |
. 2
|
| 41 | 37, 40 | impbi 157 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f1ococnv2 3708 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-br 2620 df-opab 2667 df-id 2835 df-xp 3184 df-rel 3185 df-dm 3188 df-res 3190 |