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Mirrors > Home > ILE Home > Th. List > notnotd | Unicode version |
Description: Deduction associated with notnot 559 and notnoti 574. (Contributed by Jarvin Udandy, 2-Sep-2016.) Avoid biconditional. (Revised by Wolf Lammen, 27-Mar-2021.) |
Ref | Expression |
---|---|
notnotd.1 |
Ref | Expression |
---|---|
notnotd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notnotd.1 | . 2 | |
2 | notnot 559 | . 2 | |
3 | 1, 2 | syl 14 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-in1 544 ax-in2 545 |
This theorem is referenced by: (None) |
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