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| Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-nnclavius | Unicode version | ||
| Description: Clavius law with doubly negated consequent. (Contributed by BJ, 4-Dec-2023.) |
| Ref | Expression |
|---|---|
| bj-nnclavius |
   
  |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | con3 643 |
. 2
| |
| 2 | 1 | pm2.01d 619 |
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 615 ax-in2 616 |
| This theorem is referenced by: bj-pm2.18st 14906 |
| Copyright terms: Public domain | W3C validator |