Metamath Proof Explorer


Theorem imbibi

Description: The antecedent of one side of a biconditional can be moved out of the biconditional to become the antecedent of the remaining biconditional. (Contributed by BJ, 1-Jan-2025) (Proof shortened by Wolf Lammen, 5-Jan-2025)

Ref Expression
Assertion imbibi φ ψ χ φ ψ χ

Proof

Step Hyp Ref Expression
1 pm5.4 φ φ ψ φ ψ
2 imbi2 φ ψ χ φ φ ψ φ χ
3 1 2 bitr3id φ ψ χ φ ψ φ χ
4 3 pm5.74rd φ ψ χ φ ψ χ