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| Mirrors > Home > MPE Home > Th. List > orc | Structured version Visualization version GIF version | ||
| Description: Introduction of a disjunct. Theorem *2.2 of [WhiteheadRussell] p. 104. (Contributed by NM, 30-Aug-1993.) |
| Ref | Expression |
|---|---|
| orc | ⊢ (𝜑 → (𝜑 ∨ 𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pm2.24 124 | . 2 ⊢ (𝜑 → (¬ 𝜑 → 𝜓)) | |
| 2 | 1 | orrd 864 | 1 ⊢ (𝜑 → (𝜑 ∨ 𝜓)) |
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