Theorem simp21 1030

Description: Simplification of doubly triple conjunction. (Contributed by NM, 17-Nov-2011.)

Assertion

Ref	Expression
simp21	⊢ ((𝜑 ∧ (𝜓 ∧ 𝜒 ∧ 𝜃) ∧ 𝜏) → 𝜓)

Proof of Theorem simp21

Step	Hyp	Ref	Expression
1		simp1 997	. 2 ⊢ ((𝜓 ∧ 𝜒 ∧ 𝜃) → 𝜓)
2	1	3ad2ant2 1019	1 ⊢ ((𝜑 ∧ (𝜓 ∧ 𝜒 ∧ 𝜃) ∧ 𝜏) → 𝜓)

Syntax hints:   → wi 4   ∧ w3a 978

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108

This theorem depends on definitions:  df-bi 117  df-3an 980

This theorem is referenced by:  simpl21  1075  simpr21  1084  simp121  1129  simp221  1138  simp321  1147  mulgdirlem  13019