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Specification wellfounded
specification
   sorts Elem;
   predicates 
       . ≪ . : Elem × Elem;
   
   variables 
       iHP : Elem → Bool;
       a : Elem;
       a0 : Elem;
       a1 : Elem;
   axioms 
      trans: a ≪ a0 ∧ a0 ≪ a1 → a ≪ a1;
      used for: lf, f;
      
      wellfounded: ∀ a. (∀ a0. a0 ≪ a → iHP(a0)) → iHP(a) ⊦ iHP(a);
   
end specification