Metamath Proof Explorer


Theorem 3simpb

Description: Simplification of triple conjunction. (Contributed by NM, 21-Apr-1994) (Proof shortened by Wolf Lammen, 21-Jun-2022)

Ref Expression
Assertion 3simpb φ ψ χ φ χ

Proof

Step Hyp Ref Expression
1 id φ χ φ χ
2 1 3adant2 φ ψ χ φ χ