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Mirrors > Home > ILE Home > Th. List > sb8e | Unicode version |
Description: Substitution of variable in existential quantifier. (Contributed by NM, 12-Aug-1993.) (Revised by Mario Carneiro, 6-Oct-2016.) (Proof shortened by Jim Kingdon, 15-Jan-2018.) |
Ref | Expression |
---|---|
sb8e.1 |
Ref | Expression |
---|---|
sb8e |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sb8e.1 | . 2 | |
2 | 1 | nfs1 1730 | . 2 |
3 | sbequ12 1694 | . 2 | |
4 | 1, 2, 3 | cbvex 1679 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 103 wnf 1389 wex 1421 wsb 1685 |
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-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-11 1437 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 df-nf 1390 df-sb 1686 |
This theorem is referenced by: sb8mo 1955 mo2n 1969 mor 1983 nfrexdya 2401 |
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