Description: Deduction eliminating disjunct. (Contributed by NM, 21-Jun-1994) (Proof shortened by Wolf Lammen, 3-Oct-2013)
Ref | Expression | ||
---|---|---|---|
Hypothesis | olcs.1 | |
|
Assertion | olcs | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | olcs.1 | |
|
2 | 1 | orcoms | |
3 | 2 | orcs | |