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Mirrors > Home > MPE Home > Th. List > olci | Structured version Visualization version GIF version |
Description: Deduction introducing a disjunct. (Contributed by NM, 19-Jan-2008.) (Proof shortened by Wolf Lammen, 14-Nov-2012.) |
Ref | Expression |
---|---|
orci.1 | ⊢ 𝜑 |
Ref | Expression |
---|---|
olci | ⊢ (𝜓 ∨ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orci.1 | . . 3 ⊢ 𝜑 | |
2 | 1 | a1i 11 | . 2 ⊢ (¬ 𝜓 → 𝜑) |
3 | 2 | orri 861 | 1 ⊢ (𝜓 ∨ 𝜑) |
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