Description: Triple conjunction expressed in terms of triple disjunction. (Contributed by Jeff Hankins, 15-Aug-2009) (Proof shortened by Wolf Lammen, 8-Apr-2022)
Ref | Expression | ||
---|---|---|---|
Assertion | 3anor | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3ianor | |
|
2 | 1 | con1bii | |
3 | 2 | bicomi | |