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Mirrors > Home > MPE Home > Th. List > olc | Structured version Visualization version GIF version |
Description: Introduction of a disjunct. Axiom *1.3 of [WhiteheadRussell] p. 96. (Contributed by NM, 30-Aug-1993.) |
Ref | Expression |
---|---|
olc | ⊢ (𝜑 → (𝜓 ∨ 𝜑)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1 6 | . 2 ⊢ (𝜑 → (¬ 𝜓 → 𝜑)) | |
2 | 1 | orrd 392 | 1 ⊢ (𝜑 → (𝜓 ∨ 𝜑)) |
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