Theorem rp-simp2-frege 41400

Description: Simplification of triple conjunction. Compare with simp2 1136. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.)

Assertion

Ref	Expression
rp-simp2-frege	⊢ (𝜑 → (𝜓 → (𝜒 → 𝜓)))

Proof of Theorem rp-simp2-frege

Step	Hyp	Ref	Expression
1		ax-frege1 41398	. 2 ⊢ (𝜓 → (𝜒 → 𝜓))
2		ax-frege1 41398	. 2 ⊢ ((𝜓 → (𝜒 → 𝜓)) → (𝜑 → (𝜓 → (𝜒 → 𝜓))))
3	1, 2	ax-mp 5	1 ⊢ (𝜑 → (𝜓 → (𝜒 → 𝜓)))

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-frege1 41398

This theorem is referenced by:  rp-simp2  41401  rp-frege24  41405  rp-4frege  41410