Description: Deduction adding a conjunct to antecedent. (Contributed by Glauco Siliprandi, 11-Dec-2019)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | 3adantll3.1 | ||
| Assertion | 3adantll3 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3adantll3.1 | ||
| 2 | simpll1 | ||
| 3 | simpll2 | ||
| 4 | 2 3 | jca | |
| 5 | simplr | ||
| 6 | simpr | ||
| 7 | 4 5 6 1 | syl21anc |