Metamath Proof Explorer


Theorem anabs5

Description: Absorption into embedded conjunct. (Contributed by NM, 20-Jul-1996) (Proof shortened by Wolf Lammen, 9-Dec-2012)

Ref Expression
Assertion anabs5 φφψφψ

Proof

Step Hyp Ref Expression
1 ibar φψφψ
2 1 bicomd φφψψ
3 2 pm5.32i φφψφψ