Theorem 3mix2i 1165

Description: Introduction in triple disjunction. (Contributed by Mario Carneiro, 6-Oct-2014.)

Hypothesis

Ref	Expression
3mixi.1	⊢ 𝜑

Assertion

Ref	Expression
3mix2i	⊢ (𝜓 ∨ 𝜑 ∨ 𝜒)

Proof of Theorem 3mix2i

Step	Hyp	Ref	Expression
1		3mixi.1	. 2 ⊢ 𝜑
2		3mix2 1162	. 2 ⊢ (𝜑 → (𝜓 ∨ 𝜑 ∨ 𝜒))
3	1, 2	ax-mp 5	1 ⊢ (𝜓 ∨ 𝜑 ∨ 𝜒)

Syntax hints:   ∨ w3o 972

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704

This theorem depends on definitions:  df-bi 116  df-3or 974

This theorem is referenced by:  tpid2  3696  tpid2g  3697