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| Description: Elimination of a conjunct. Theorem *3.27 (Simp) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-1993.) (Proof shortened by Wolf Lammen, 13-Nov-2012.) |
| Ref | Expression |
|---|---|
| simpr |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | idd 24 |
. 2
| |
| 2 | 1 | imp 445 |
1
|
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