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| Description: An identity law for the non-logical predicate. |
| Ref | Expression |
|---|---|
| elequ1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-13 969 |
. 2
| |
| 2 | ax-13 969 |
. . 3
| |
| 3 | 2 | equcoms 1130 |
. 2
|
| 4 | 1, 3 | impbid 516 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: cleljust 1328 elsb3 1331 dveel1 1356 ax15 1359 ax11el 1364 axsep 2702 nalset 2712 axpow 2743 dtruALT 2748 axun 2867 pssnn 4534 axinf 4623 aceq0 4730 axac 4745 nd1 4938 axextnd 4943 axrepndlem1 4944 axrepndlem2 4945 axunndlem1 4947 axunnd 4948 axpowndlem2 4950 axpowndlem3 4951 axpowndlem4 4952 axregndlem1 4954 axregndlem2 4955 axregnd 4956 axinfnd 4958 axacndlem5 4963 axacnd 4964 zfcndun 4967 zfcndpow 4968 zfcndinf 4970 zfcndac 4971 tgval3t 7625 tgss2t 7637 basgen2t 7639 axgroth3 8779 axgroth4 8780 grothinf 8781 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-gen 963 ax-8 964 ax-12 968 ax-13 969 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 |
| This theorem depends on definitions: df-bi 147 df-an 225 |