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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 |
|---|---|
| relss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 1502 |
. . . . 5
| |
| 2 | 1 | a1i 7 |
. . . 4
|
| 3 | 2 | 19.21adv 945 |
. . 3
|
| 4 | 3 | 19.21adv 945 |
. 2
|
| 5 | df-rel 2425 |
. . . . . . . 8
| |
| 6 | ssel 1502 |
. . . . . . . 8
| |
| 7 | 5, 6 | sylbi 174 |
. . . . . . 7
|
| 8 | elvv 2464 |
. . . . . . 7
| |
| 9 | 7, 8 | syl6ib 185 |
. . . . . 6
|
| 10 | id 9 |
. . . . . . . . . . . . . 14
| |
| 11 | 10 | anim2d 433 |
. . . . . . . . . . . . 13
|
| 12 | eleq1 1149 |
. . . . . . . . . . . . . 14
| |
| 13 | 12 | biimpar 325 |
. . . . . . . . . . . . 13
|
| 14 | 11, 13 | syl6 23 |
. . . . . . . . . . . 12
|
| 15 | eleq1 1149 |
. . . . . . . . . . . . 13
| |
| 16 | 15 | pm5.32i 489 |
. . . . . . . . . . . 12
|
| 17 | 14, 16 | syl5ib 181 |
. . . . . . . . . . 11
|
| 18 | 17 | exp3a 292 |
. . . . . . . . . 10
|
| 19 | 18 | 19.20i 691 |
. . . . . . . . 9
|
| 20 | 19.23v 950 |
. . . . . . . . 9
| |
| 21 | 19, 20 | sylib 173 |
. . . . . . . 8
|
| 22 | 21 | 19.20i 691 |
. . . . . . 7
|
| 23 | 19.23v 950 |
. . . . . . 7
| |
| 24 | 22, 23 | sylib 173 |
. . . . . 6
|
| 25 | 9, 24 | syl9 55 |
. . . . 5
|
| 26 | pm2.43 57 |
. . . . 5
| |
| 27 | 25, 26 | syl6 23 |
. . . 4
|
| 28 | 27 | 19.21adv 945 |
. . 3
|
| 29 | dfss2 1497 |
. . 3
| |
| 30 | 28, 29 | syl6ibr 186 |
. 2
|
| 31 | 4, 30 | impbid 397 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: relssi 2481 relssdv 2482 cleqrel 2483 intasym 2627 |
| 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-opab 2098 df-xp 2424 df-rel 2425 |