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Mirrors > Home > ILE Home > Th. List > equs4 | Unicode version |
Description: Lemma used in proofs of substitution properties. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Mario Carneiro, 20-May-2014.) |
Ref | Expression |
---|---|
equs4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | a9e 1626 | . . 3 | |
2 | 19.29 1551 | . . 3 | |
3 | 1, 2 | mpan2 415 | . 2 |
4 | ancl 311 | . . . 4 | |
5 | 4 | imp 122 | . . 3 |
6 | 5 | eximi 1531 | . 2 |
7 | 3, 6 | syl 14 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wal 1282 wceq 1284 wex 1421 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-4 1440 ax-i9 1463 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: sb2 1690 equs45f 1723 |
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