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Related theorems Unicode version |
| Description: The collection of ordered pairs in a class is a subclass of it. |
| Ref | Expression |
|---|---|
| opabss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-opab 2098 |
. . 3
| |
| 2 | eleq1 1149 |
. . . . . . 7
| |
| 3 | 2 | biimpar 325 |
. . . . . 6
|
| 4 | df-br 2063 |
. . . . . 6
| |
| 5 | 3, 4 | sylan2b 347 |
. . . . 5
|
| 6 | 5 | 19.23aivv 953 |
. . . 4
|
| 7 | 6 | ss2abi 1552 |
. . 3
|
| 8 | 1, 7 | eqsstr 1530 |
. 2
|
| 9 | abid2 1186 |
. 2
| |
| 10 | 8, 9 | sseqtr 1532 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: cotr 2625 cnvsym 2626 |
| 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-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-in 1491 df-ss 1492 df-br 2063 df-opab 2098 |