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Mirrors > Home > ILE Home > Th. List > 19.42vvvv | Unicode version |
Description: Theorem 19.42 of [Margaris] p. 90 with 4 quantifiers. (Contributed by Jim Kingdon, 23-Nov-2019.) |
Ref | Expression |
---|---|
19.42vvvv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.42vv 1788 | . . 3 | |
2 | 1 | 2exbii 1497 | . 2 |
3 | 19.42vv 1788 | . 2 | |
4 | 2, 3 | bitri 173 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 97 wb 98 wex 1381 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-5 1336 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-4 1400 ax-17 1419 ax-ial 1427 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: ceqsex8v 2599 enq0tr 6532 |
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