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| Description: Ordered-pair membership in converse. |
| Ref | Expression |
|---|---|
| opelcnv.1 |
|
| opelcnv.2 |
|
| Ref | Expression |
|---|---|
| opelcnv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opelcnv.1 |
. 2
| |
| 2 | opelcnv.2 |
. 2
| |
| 3 | opelcnvg 2517 |
. 2
| |
| 4 | 1, 2, 3 | mp2an 520 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: brcnv 2519 cnvopab 2632 cnv0 2633 cnvsn 2636 cnvun 2642 cnvin 2643 cnvxp 2651 dfrel2 2660 dmco2 2673 fcnvres 2768 pw2en 3348 sbthcl 3361 brsdom2 3363 |
| 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-br 2063 df-opab 2098 df-cnv 2426 |