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| Description: An identity law for the non-logical predicate. |
| Ref | Expression |
|---|---|
| elequ1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-13 966 |
. 2
| |
| 2 | ax-13 966 |
. . 3
| |
| 3 | 2 | equcoms 1126 |
. 2
|
| 4 | 1, 3 | impbid 514 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: cleljust 1323 elsb3 1326 dveel1 1349 ax15 1352 ax11el 1357 axsep 2692 nalset 2702 axpow 2733 dtruALT 2738 axun 2858 pssnn 4513 axinf 4595 aceq0 4702 axac 4717 nd1 4910 axextnd 4915 axrepndlem1 4916 axrepndlem2 4917 axunndlem1 4919 axunnd 4920 axpowndlem2 4922 axpowndlem3 4923 axpowndlem4 4924 axregndlem1 4926 axregndlem2 4927 axregnd 4928 axinfnd 4930 axacndlem5 4935 axacnd 4936 zfcndun 4939 zfcndpow 4940 zfcndinf 4942 zfcndac 4943 tgval3t 7567 tgss2t 7579 basgen2t 7581 axgroth3 8718 axgroth4 8719 grothinf 8720 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-gen 960 ax-8 961 ax-12 965 ax-13 966 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 |
| This theorem depends on definitions: df-bi 147 df-an 225 |