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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 |
|---|---|
| ssrel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 2063 |
. . . . 5
| |
| 2 | 1 | a1i 8 |
. . . 4
|
| 3 | 2 | 19.21adv 1288 |
. . 3
|
| 4 | 3 | 19.21adv 1288 |
. 2
|
| 5 | df-rel 3185 |
. . . . . . . 8
| |
| 6 | ssel 2063 |
. . . . . . . 8
| |
| 7 | 5, 6 | sylbi 199 |
. . . . . . 7
|
| 8 | elvv 3228 |
. . . . . . 7
| |
| 9 | 7, 8 | syl6ib 212 |
. . . . . 6
|
| 10 | id 59 |
. . . . . . . . . . . . . 14
| |
| 11 | 10 | anim2d 561 |
. . . . . . . . . . . . 13
|
| 12 | eleq1 1534 |
. . . . . . . . . . . . . 14
| |
| 13 | 12 | biimpar 417 |
. . . . . . . . . . . . 13
|
| 14 | 11, 13 | syl6 22 |
. . . . . . . . . . . 12
|
| 15 | eleq1 1534 |
. . . . . . . . . . . . 13
| |
| 16 | 15 | pm5.32i 645 |
. . . . . . . . . . . 12
|
| 17 | 14, 16 | syl5ib 206 |
. . . . . . . . . . 11
|
| 18 | 17 | exp3a 375 |
. . . . . . . . . 10
|
| 19 | 18 | 19.20i 992 |
. . . . . . . . 9
|
| 20 | 19.23v 1293 |
. . . . . . . . 9
| |
| 21 | 19, 20 | sylib 198 |
. . . . . . . 8
|
| 22 | 21 | 19.20i 992 |
. . . . . . 7
|
| 23 | 19.23v 1293 |
. . . . . . 7
| |
| 24 | 22, 23 | sylib 198 |
. . . . . 6
|
| 25 | 9, 24 | syl9 57 |
. . . . 5
|
| 26 | pm2.43 63 |
. . . . 5
| |
| 27 | 25, 26 | syl6 22 |
. . . 4
|
| 28 | 27 | 19.21adv 1288 |
. . 3
|
| 29 | dfss2 2058 |
. . 3
| |
| 30 | 28, 29 | syl6ibr 213 |
. 2
|
| 31 | 4, 30 | impbid 516 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: relssi 3248 relssdv 3249 eqrel 3250 intasym 3438 |
| 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-opab 2667 df-xp 3184 df-rel 3185 |