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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 |
Ref | Expression |
---|---|
niabn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 447 | . 2 | |
2 | niabn.1 | . . 3 | |
3 | 2 | pm2.24i 136 | . 2 |
4 | 1, 3 | pm5.21ni 341 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 176 wa 358 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |
This theorem depends on definitions: df-bi 177 df-an 360 |
This theorem is referenced by: ninba 927 |
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