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Mirrors > Home > NFE Home > Th. List > niabn | Unicode version |
Description: Miscellaneous inference relating falsehoods. (Contributed by NM, 31-Mar-1994.) |
Ref | Expression |
---|---|
niabn.1 |
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Ref | Expression |
---|---|
niabn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 447 |
. 2
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2 | niabn.1 |
. . 3
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3 | 2 | pm2.24i 136 |
. 2
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4 | 1, 3 | pm5.21ni 341 |
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 |
This theorem depends on definitions: df-bi 177 df-an 360 |
This theorem is referenced by: ninba 927 |
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