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Mirrors > Home > ILE Home > Th. List > 19.23vv | Unicode version |
Description: Theorem 19.23 of [Margaris] p. 90 extended to two variables. (Contributed by NM, 10-Aug-2004.) |
Ref | Expression |
---|---|
19.23vv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.23v 1763 | . . 3 | |
2 | 1 | albii 1359 | . 2 |
3 | 19.23v 1763 | . 2 | |
4 | 2, 3 | bitri 173 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 98 wal 1241 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-ie2 1383 ax-17 1419 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: ssrel 4428 ssrelrel 4440 raliunxp 4477 |
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