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Mirrors > Home > NFE Home > Th. List > alexn | Unicode version |
Description: A relationship between two quantifiers and negation. (Contributed by NM, 18-Aug-1993.) |
Ref | Expression |
---|---|
alexn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exnal 1574 |
. . 3
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2 | 1 | albii 1566 |
. 2
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3 | alnex 1543 |
. 2
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4 | 2, 3 | bitri 240 |
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 |
This theorem depends on definitions: df-bi 177 df-ex 1542 |
This theorem is referenced by: 2exnexn 1580 |
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