Theorem mp2d 41

Description: A double modus ponens deduction. (Contributed by NM, 23-May-2013.) (Proof shortened by Wolf Lammen, 23-Jul-2013.)

Hypotheses

Ref	Expression
mp2d.1	⊢ (𝜑 → 𝜓)
mp2d.2	⊢ (𝜑 → 𝜒)
mp2d.3	⊢ (𝜑 → (𝜓 → (𝜒 → 𝜃)))

Assertion

Ref	Expression
mp2d	⊢ (𝜑 → 𝜃)

Proof of Theorem mp2d

Step	Hyp	Ref	Expression
1		mp2d.1	. 2 ⊢ (𝜑 → 𝜓)
2		mp2d.2	. . 3 ⊢ (𝜑 → 𝜒)
3		mp2d.3	. . 3 ⊢ (𝜑 → (𝜓 → (𝜒 → 𝜃)))
4	2, 3	mpid 37	. 2 ⊢ (𝜑 → (𝜓 → 𝜃))
5	1, 4	mpd 13	1 ⊢ (𝜑 → 𝜃)

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7

This theorem is referenced by:  prloc  6589  axcaucvglemres  6973  sqrt2irr  9878