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Mirrors > Home > MPE Home > Th. List > jaod | Structured version Visualization version GIF version |
Description: Deduction disjoining the antecedents of two implications. (Contributed by NM, 18-Aug-1994.) |
Ref | Expression |
---|---|
jaod.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) |
jaod.2 | ⊢ (𝜑 → (𝜃 → 𝜒)) |
Ref | Expression |
---|---|
jaod | ⊢ (𝜑 → ((𝜓 ∨ 𝜃) → 𝜒)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | jaod.1 | . . . 4 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
2 | 1 | com12 32 | . . 3 ⊢ (𝜓 → (𝜑 → 𝜒)) |
3 | jaod.2 | . . . 4 ⊢ (𝜑 → (𝜃 → 𝜒)) | |
4 | 3 | com12 32 | . . 3 ⊢ (𝜃 → (𝜑 → 𝜒)) |
5 | 2, 4 | jaoi 854 | . 2 ⊢ ((𝜓 ∨ 𝜃) → (𝜑 → 𝜒)) |
6 | 5 | com12 32 | 1 ⊢ (𝜑 → ((𝜓 ∨ 𝜃) → 𝜒)) |
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