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Mirrors > Home > ILE Home > Th. List > 19.12 | Unicode version |
Description: Theorem 19.12 of [Margaris] p. 89. Assuming the converse is a mistake sometimes made by beginners! (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
19.12 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hba1 1527 | . . 3 | |
2 | 1 | hbex 1623 | . 2 |
3 | ax-4 1497 | . . 3 | |
4 | 3 | eximi 1587 | . 2 |
5 | 2, 4 | alrimih 1456 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wal 1340 wex 1479 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-4 1497 ax-ial 1521 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: hbexd 1681 nfexd 1748 cbvexdh 1913 |
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