Theorem adh-minim-ax2-lem6

Description: Sixth lemma for the derivation of ax-2 from adh-minim and ax-mp . Polish prefix notation: CCpCCCCqrsCCrCstCrtuCpu . (Contributed by ADH, 10-Nov-2023) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	adh-minim-ax2-lem6	⊢ ( ( 𝜑 → ( ( ( ( 𝜓 → 𝜒 ) → 𝜃 ) → ( ( 𝜒 → ( 𝜃 → 𝜏 ) ) → ( 𝜒 → 𝜏 ) ) ) → 𝜂 ) ) → ( 𝜑 → 𝜂 ) )

Proof

Step	Hyp	Ref	Expression
1		adh-minim-ax2-lem5	⊢ ( ( 𝜁 → 𝜑 ) → ( ( ( 𝜓 → 𝜒 ) → 𝜃 ) → ( ( 𝜒 → ( 𝜃 → 𝜏 ) ) → ( 𝜒 → 𝜏 ) ) ) )
2		adh-minim-ax1-ax2-lem4	⊢ ( ( ( 𝜁 → 𝜑 ) → ( ( ( 𝜓 → 𝜒 ) → 𝜃 ) → ( ( 𝜒 → ( 𝜃 → 𝜏 ) ) → ( 𝜒 → 𝜏 ) ) ) ) → ( ( 𝜑 → ( ( ( ( 𝜓 → 𝜒 ) → 𝜃 ) → ( ( 𝜒 → ( 𝜃 → 𝜏 ) ) → ( 𝜒 → 𝜏 ) ) ) → 𝜂 ) ) → ( 𝜑 → 𝜂 ) ) )
3	1 2	ax-mp	⊢ ( ( 𝜑 → ( ( ( ( 𝜓 → 𝜒 ) → 𝜃 ) → ( ( 𝜒 → ( 𝜃 → 𝜏 ) ) → ( 𝜒 → 𝜏 ) ) ) → 𝜂 ) ) → ( 𝜑 → 𝜂 ) )