Metamath Proof Explorer


Theorem uun123p2

Description: A deduction unionizing a non-unionized collection of virtual hypotheses. (Contributed by Alan Sare, 4-Feb-2017) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Hypothesis uun123p2.1 χ φ ψ θ
Assertion uun123p2 φ ψ χ θ

Proof

Step Hyp Ref Expression
1 uun123p2.1 χ φ ψ θ
2 1 3coml φ ψ χ θ