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Mirrors > Home > ILE Home > Th. List > jaoi | GIF version |
Description: Inference disjoining the antecedents of two implications. (Contributed by NM, 5-Apr-1994.) (Revised by NM, 31-Jan-2015.) |
Ref | Expression |
---|---|
jaoi.1 | ⊢ (𝜑 → 𝜓) |
jaoi.2 | ⊢ (𝜒 → 𝜓) |
Ref | Expression |
---|---|
jaoi | ⊢ ((𝜑 ∨ 𝜒) → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | jaoi.1 | . 2 ⊢ (𝜑 → 𝜓) | |
2 | jaoi.2 | . 2 ⊢ (𝜒 → 𝜓) | |
3 | pm3.44 705 | . 2 ⊢ (((𝜑 → 𝜓) ∧ (𝜒 → 𝜓)) → ((𝜑 ∨ 𝜒) → 𝜓)) | |
4 | 1, 2, 3 | mp2an 423 | 1 ⊢ ((𝜑 ∨ 𝜒) → 𝜓) |
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