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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hba1 1433 |
. . 3
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2 | 1 | hbex 1527 |
. 2
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3 | ax-4 1400 |
. . 3
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4 | 3 | eximi 1491 |
. 2
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5 | 2, 4 | alrimih 1358 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
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-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-4 1400 ax-ial 1427 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: hbexd 1584 nfexd 1644 cbvexdh 1801 |
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