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| Description: An identity law for the non-logical predicate. |
| Ref | Expression |
|---|---|
| elequ1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-13 967 |
. 2
| |
| 2 | ax-13 967 |
. . 3
| |
| 3 | 2 | equcoms 1128 |
. 2
|
| 4 | 1, 3 | impbid 515 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: cleljust 1326 elsb3 1329 dveel1 1354 ax15 1357 ax11el 1362 axsep 2697 nalset 2707 axpow 2738 dtruALT 2743 axun 2862 pssnn 4519 axinf 4603 aceq0 4710 axac 4725 nd1 4918 axextnd 4923 axrepndlem1 4924 axrepndlem2 4925 axunndlem1 4927 axunnd 4928 axpowndlem2 4930 axpowndlem3 4931 axpowndlem4 4932 axregndlem1 4934 axregndlem2 4935 axregnd 4936 axinfnd 4938 axacndlem5 4943 axacnd 4944 zfcndun 4947 zfcndpow 4948 zfcndinf 4950 zfcndac 4951 tgval3t 7575 tgss2t 7587 basgen2t 7589 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 961 ax-8 962 ax-12 966 ax-13 967 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 |
| This theorem depends on definitions: df-bi 147 df-an 225 |