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| Description: A subclass relationship depends only on a relation's ordered pairs. Theorem 3.2(i) of [Monk1] p. 33. |
| Ref | Expression |
|---|---|
| ssrelOLD |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 2615 |
. . 3
| |
| 2 | 1 | 19.21aivv 1665 |
. 2
|
| 3 | df-rel 4001 |
. . . . . . . 8
| |
| 4 | ssel 2615 |
. . . . . . . 8
| |
| 5 | 3, 4 | sylbi 216 |
. . . . . . 7
|
| 6 | elvv 4053 |
. . . . . . 7
| |
| 7 | 5, 6 | syl6ib 229 |
. . . . . 6
|
| 8 | id 73 |
. . . . . . . . . . . . . 14
| |
| 9 | 8 | anim2d 620 |
. . . . . . . . . . . . 13
|
| 10 | eleq1 1957 |
. . . . . . . . . . . . . 14
| |
| 11 | 10 | biimpar 461 |
. . . . . . . . . . . . 13
|
| 12 | 9, 11 | syl6 25 |
. . . . . . . . . . . 12
|
| 13 | eleq1 1957 |
. . . . . . . . . . . . 13
| |
| 14 | 13 | pm5.32i 707 |
. . . . . . . . . . . 12
|
| 15 | 12, 14 | syl5ib 223 |
. . . . . . . . . . 11
|
| 16 | 15 | exp3a 405 |
. . . . . . . . . 10
|
| 17 | 16 | alimi 1338 |
. . . . . . . . 9
|
| 18 | 19.23v 1672 |
. . . . . . . . 9
| |
| 19 | 17, 18 | sylib 215 |
. . . . . . . 8
|
| 20 | 19 | alimi 1338 |
. . . . . . 7
|
| 21 | 19.23v 1672 |
. . . . . . 7
| |
| 22 | 20, 21 | sylib 215 |
. . . . . 6
|
| 23 | 7, 22 | syl9 71 |
. . . . 5
|
| 24 | pm2.43 77 |
. . . . 5
| |
| 25 | 23, 24 | syl6 25 |
. . . 4
|
| 26 | 25 | 19.21adv 1666 |
. . 3
|
| 27 | dfss2 2610 |
. . 3
| |
| 28 | 26, 27 | syl6ibr 230 |
. 2
|
| 29 | 2, 28 | impbid2 576 |
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 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-opab 3396 df-xp 4000 df-rel 4001 |