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Mirrors > Home > ILE Home > Th. List > orcs | GIF version |
Description: Deduction eliminating disjunct. Notational convention: We sometimes suffix with "s" the label of an inference that manipulates an antecedent, leaving the consequent unchanged. The "s" means that the inference eliminates the need for a syllogism (syl 14) -type inference in a proof. (Contributed by NM, 21-Jun-1994.) |
Ref | Expression |
---|---|
orcs.1 | ⊢ ((𝜑 ∨ 𝜓) → 𝜒) |
Ref | Expression |
---|---|
orcs | ⊢ (𝜑 → 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 707 | . 2 ⊢ (𝜑 → (𝜑 ∨ 𝜓)) | |
2 | orcs.1 | . 2 ⊢ ((𝜑 ∨ 𝜓) → 𝜒) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → 𝜒) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∨ wo 703 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-io 704 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: olcs 731 sqxpeq0 5032 |
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