Metamath Proof Explorer


Theorem an52ds

Description: Inference exchanging the last antecedent with the second. (Contributed by Thierry Arnoux, 3-Jun-2025)

Ref Expression
Hypothesis an52ds.1 ⊢ φ ∧ ψ ∧ χ ∧ θ ∧ τ → η
Assertion an52ds ⊢ φ ∧ τ ∧ χ ∧ θ ∧ ψ → η

Proof

Step Hyp Ref Expression
1 an52ds.1 ⊢ φ ∧ ψ ∧ χ ∧ θ ∧ τ → η
2 an32 ⊢ φ ∧ ψ ∧ τ ↔ φ ∧ τ ∧ ψ
3 2 anbi1i ⊢ φ ∧ ψ ∧ τ ∧ θ ↔ φ ∧ τ ∧ ψ ∧ θ
4 1 an42ds ⊢ φ ∧ ψ ∧ τ ∧ θ ∧ χ → η
5 3 4 sylanbr ⊢ φ ∧ τ ∧ ψ ∧ θ ∧ χ → η
6 5 an42ds ⊢ φ ∧ τ ∧ χ ∧ θ ∧ ψ → η