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| Description: Elimination of a conjunct. Theorem *3.26 (Simp) of [WhiteheadRussell] p. 112. |
| Ref | Expression |
|---|---|
| pm3.26 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-an 225 |
. 2
| |
| 2 | pm3.26im 139 |
. 2
| |
| 3 | 1, 2 | sylbi 199 |
1
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