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Mirrors > Home > ILE Home > Th. List > notnotd | Unicode version |
Description: Deduction associated with notnot 603 and notnoti 619. (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 603 | . 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-mp 5 ax-1 6 ax-2 7 ax-in1 588 ax-in2 589 |
This theorem is referenced by: ismkvnex 6997 exmidonfinlem 7017 mod2eq1n2dvds 11503 |
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