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Description: Deduction eliminating a conjunct. (Contributed by Alan Sare, 31-Dec-2011)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | simplbi2.1 | ||
| Assertion | simplbi2 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simplbi2.1 | ||
| 2 | 1 | biimpri | |
| 3 | 2 | ex |