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Mirrors > Home > NFE Home > Th. List > 19.9vOLD | Unicode version |
Description: Obsolete version of 19.9v 1664 as of 4-Dec-2017. (Contributed by NM, 28-May-1995.) (Revised by NM, 1-Aug-2017.) (New usage is discouraged.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
19.9vOLD |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ex 1542 |
. 2
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2 | 19.3v 1665 |
. . 3
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3 | 2 | con2bii 322 |
. 2
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4 | 1, 3 | bitr4i 243 |
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 |
This theorem depends on definitions: df-bi 177 df-an 360 df-ex 1542 |
This theorem is referenced by: (None) |
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