Theorem intn3an2d 1478

Description: Introduction of a triple conjunct inside a contradiction. (Contributed by FL, 27-Dec-2007.) (Proof shortened by Andrew Salmon, 26-Jun-2011.)

Hypothesis

Ref	Expression
intn3and.1	⊢ (𝜑 → ¬ 𝜓)

Assertion

Ref	Expression
intn3an2d	⊢ (𝜑 → ¬ (𝜒 ∧ 𝜓 ∧ 𝜃))

Proof of Theorem intn3an2d

Step	Hyp	Ref	Expression
1		intn3and.1	. 2 ⊢ (𝜑 → ¬ 𝜓)
2		simp2 1135	. 2 ⊢ ((𝜒 ∧ 𝜓 ∧ 𝜃) → 𝜓)
3	1, 2	nsyl 140	1 ⊢ (𝜑 → ¬ (𝜒 ∧ 𝜓 ∧ 𝜃))

Syntax hints:  ¬ wn 3   → wi 4   ∧ w3a 1085

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 206  df-an 396  df-3an 1087

This theorem is referenced by:  frxp3  33724  iooelexlt  35460  lenelioc  42964  icccncfext  43318  fourierdlem10  43548  fourierdlem104  43641  cznnring  45402