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Mirrors > Home > ILE Home > Th. List > ax-in2 | Unicode version |
Description: 'Not' elimination. One of the axioms of propositional logic. (Contributed by Mario Carneiro, 31-Jan-2015.) |
Ref | Expression |
---|---|
ax-in2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 | |
2 | 1 | wn 3 | . 2 |
3 | wps | . . 3 | |
4 | 1, 3 | wi 4 | . 2 |
5 | 2, 4 | wi 4 | 1 |
Colors of variables: wff set class |
This axiom is referenced by: pm2.21 607 con2d 614 imorr 711 dcim 827 condcOLD 840 pm5.14dc 897 pm5.54dc 904 mon 2035 difin 3344 indifdir 3363 sosng 4659 iotanul 5150 |
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