User interface:Raph/Sandbox

 param (CLASSICAL Interface:Classical_propositional_calculus ) param (FIRSTORDER Interface:First-order_logic (CLASSICAL) )
 * 1) param (PEANO Interface:Peano_axioms (CLASSICAL FIRSTORDER) )

var (formula φ ψ χ) var (variable x y z)

stmt (ForAllImplicationThereExists  ((∀ x (φ → ψ)) → ((∃ x φ) → (∃ x ψ)))) 