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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 2059 |
. . . . 5
| |
| 2 | 1 | a1i 8 |
. . . 4
|
| 3 | 2 | 19.21adv 1286 |
. . 3
|
| 4 | 3 | 19.21adv 1286 |
. 2
|
| 5 | df-rel 3180 |
. . . . . . . 8
| |
| 6 | ssel 2059 |
. . . . . . . 8
| |
| 7 | 5, 6 | sylbi 199 |
. . . . . . 7
|
| 8 | elvv 3223 |
. . . . . . 7
| |
| 9 | 7, 8 | syl6ib 212 |
. . . . . 6
|
| 10 | id 59 |
. . . . . . . . . . . . . 14
| |
| 11 | 10 | anim2d 560 |
. . . . . . . . . . . . 13
|
| 12 | eleq1 1531 |
. . . . . . . . . . . . . 14
| |
| 13 | 12 | biimpar 417 |
. . . . . . . . . . . . 13
|
| 14 | 11, 13 | syl6 22 |
. . . . . . . . . . . 12
|
| 15 | eleq1 1531 |
. . . . . . . . . . . . 13
| |
| 16 | 15 | pm5.32i 644 |
. . . . . . . . . . . 12
|
| 17 | 14, 16 | syl5ib 206 |
. . . . . . . . . . 11
|
| 18 | 17 | exp3a 375 |
. . . . . . . . . 10
|
| 19 | 18 | 19.20i 990 |
. . . . . . . . 9
|
| 20 | 19.23v 1291 |
. . . . . . . . 9
| |
| 21 | 19, 20 | sylib 198 |
. . . . . . . 8
|
| 22 | 21 | 19.20i 990 |
. . . . . . 7
|
| 23 | 19.23v 1291 |
. . . . . . 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 1286 |
. . 3
|
| 29 | dfss2 2054 |
. . 3
| |
| 30 | 28, 29 | syl6ibr 213 |
. 2
|
| 31 | 4, 30 | impbid 515 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: relssi 3243 relssdv 3244 eqrel 3245 intasym 3430 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-pr 2774 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-opab 2662 df-xp 3179 df-rel 3180 |