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| Description: Inference adding a conjunct to the left of an antecedent. |
| Ref | Expression |
|---|---|
| adantl.1 |
|
| Ref | Expression |
|---|---|
| adantl |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | adantl.1 |
. . 3
| |
| 2 | 1 | a1i 7 |
. 2
|
| 3 | 2 | imp 277 |
1
|