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Mirrors > Home > ILE Home > Th. List > pm1.2 | GIF version |
Description: Axiom *1.2 (Taut) of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.) (Revised by NM, 10-Mar-2013.) |
Ref | Expression |
---|---|
pm1.2 | ⊢ ((𝜑 ∨ 𝜑) → 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . 2 ⊢ (𝜑 → 𝜑) | |
2 | 1, 1 | jaoi 668 | 1 ⊢ ((𝜑 ∨ 𝜑) → 𝜑) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∨ wo 661 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: oridm 706 sbequi 1760 swoer 6157 |
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