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Mirrors > Home > NFE Home > Th. List > drex1 | Unicode version |
Description: Formula-building lemma for use with the Distinctor Reduction Theorem. Part of Theorem 9.4 of [Megill] p. 448 (p. 16 of preprint). (Contributed by NM, 27-Feb-2005.) |
Ref | Expression |
---|---|
dral1.1 |
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Ref | Expression |
---|---|
drex1 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dral1.1 |
. . . . 5
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2 | 1 | notbid 285 |
. . . 4
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3 | 2 | dral1 1965 |
. . 3
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4 | 3 | notbid 285 |
. 2
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5 | df-ex 1542 |
. 2
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6 | df-ex 1542 |
. 2
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7 | 4, 5, 6 | 3bitr4g 279 |
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-7 1734 ax-11 1746 ax-12 1925 |
This theorem depends on definitions: df-bi 177 df-an 360 df-tru 1319 df-ex 1542 df-nf 1545 |
This theorem is referenced by: exdistrf 1971 drsb1 2022 eujustALT 2207 copsexg 4608 dfid3 4769 |
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