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Mirrors > Home > NFE Home > Th. List > 19.9t | Unicode version |
Description: A closed version of 19.9 1783. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.) (Proof shortended by Wolf Lammen, 30-Dec-2017.) |
Ref | Expression |
---|---|
19.9t |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-nf 1545 |
. . 3
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2 | 19.9ht 1778 |
. . 3
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3 | 1, 2 | sylbi 187 |
. 2
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4 | 19.8a 1756 |
. 2
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5 | 3, 4 | impbid1 194 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-11 1746 |
This theorem depends on definitions: df-bi 177 df-ex 1542 df-nf 1545 |
This theorem is referenced by: 19.9h 1780 19.9d 1782 19.9OLD 1784 19.21t 1795 19.23t 1800 19.23tOLD 1819 vtoclegft 2927 |
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