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| Description: Commutation in antecedent. Swap 1st and 3rd. |
| Ref | Expression |
|---|---|
| 3exp.1 |
|
| Ref | Expression |
|---|---|
| 3com12 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3exp.1 |
. . . 4
| |
| 2 | 1 | 3exp 832 |
. . 3
|
| 3 | 2 | com12 11 |
. 2
|
| 4 | 3 | 3imp 827 |
1
|