Theorem imbitrrid

Description: A mixed syllogism inference. (Contributed by NM, 3-Apr-1994)

	Ref	Expression
Hypotheses	imbitrrid.1	⊢ ( 𝜑 → 𝜃 )
	imbitrrid.2	⊢ ( 𝜒 → ( 𝜓 ↔ 𝜃 ) )
Assertion	imbitrrid	⊢ ( 𝜒 → ( 𝜑 → 𝜓 ) )

Proof

Step	Hyp	Ref	Expression
1		imbitrrid.1	⊢ ( 𝜑 → 𝜃 )
2		imbitrrid.2	⊢ ( 𝜒 → ( 𝜓 ↔ 𝜃 ) )
3	2	bicomd	⊢ ( 𝜒 → ( 𝜃 ↔ 𝜓 ) )
4	1 3	imbitrid	⊢ ( 𝜒 → ( 𝜑 → 𝜓 ) )