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| Description: Deduce conjunction of the consequents of two implications ("join consequents with 'and'"). |
| Ref | Expression |
|---|---|
| jca.1 |
|
| jca.2 |
|
| Ref | Expression |
|---|---|
| jca |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | jca.1 |
. . 3
| |
| 2 | jca.2 |
. . 3
| |
| 3 | 1, 2 | jc 138 |
. 2
|
| 4 | df-an 225 |
. 2
| |
| 5 | 3, 4 | sylibr 200 |
1
|