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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 2034 |
. . . . 5
| |
| 2 | 1 | a1i 8 |
. . . 4
|
| 3 | 2 | 19.21adv 1270 |
. . 3
|
| 4 | 3 | 19.21adv 1270 |
. 2
|
| 5 | df-rel 3148 |
. . . . . . . 8
| |
| 6 | ssel 2034 |
. . . . . . . 8
| |
| 7 | 5, 6 | sylbi 199 |
. . . . . . 7
|
| 8 | elvv 3190 |
. . . . . . 7
| |
| 9 | 7, 8 | syl6ib 212 |
. . . . . 6
|
| 10 | id 59 |
. . . . . . . . . . . . . 14
| |
| 11 | 10 | anim2d 559 |
. . . . . . . . . . . . 13
|
| 12 | eleq1 1510 |
. . . . . . . . . . . . . 14
| |
| 13 | 12 | biimpar 417 |
. . . . . . . . . . . . 13
|
| 14 | 11, 13 | syl6 22 |
. . . . . . . . . . . 12
|
| 15 | eleq1 1510 |
. . . . . . . . . . . . 13
| |
| 16 | 15 | pm5.32i 643 |
. . . . . . . . . . . 12
|
| 17 | 14, 16 | syl5ib 206 |
. . . . . . . . . . 11
|
| 18 | 17 | exp3a 375 |
. . . . . . . . . 10
|
| 19 | 18 | 19.20i 968 |
. . . . . . . . 9
|
| 20 | 19.23v 1275 |
. . . . . . . . 9
| |
| 21 | 19, 20 | sylib 198 |
. . . . . . . 8
|
| 22 | 21 | 19.20i 968 |
. . . . . . 7
|
| 23 | 19.23v 1275 |
. . . . . . 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 1270 |
. . 3
|
| 29 | dfss2 2029 |
. . 3
| |
| 30 | 28, 29 | syl6ibr 213 |
. 2
|
| 31 | 4, 30 | impbid 514 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: relssi 3210 relssdv 3211 eqrel 3212 intasym 3389 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-4 951 ax-5 952 ax-6 953 ax-7 954 ax-gen 955 ax-8 1101 ax-9 1102 ax-10 1103 ax-12 1104 ax-13 1107 ax-14 1108 ax-11 1180 ax-17 1190 ax-16 1194 ax-11o 1202 ax-ext 1436 ax-sep 2671 ax-pow 2710 ax-pr 2747 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 957 df-sb 1155 df-eu 1359 df-mo 1360 df-clab 1441 df-cleq 1446 df-clel 1449 df-ne 1563 df-v 1787 df-dif 2020 df-un 2021 df-in 2022 df-ss 2024 df-nul 2252 df-pw 2373 df-sn 2383 df-pr 2384 df-op 2387 df-opab 2635 df-xp 3147 df-rel 3148 |