Specification wellfounded-TL

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enrich
   wellfounded, 
   nat-basic
with
   

   
   
   
   
   
   variables  A : elem flexible;
              N : nat flexible;
   
   

   

   

   theorems not-always-decrease : □ ⟨a := A⟩ (◇ A ≪ a) ⊦ ;
            always-noincrease-stable : □ (A'' ≪ A ∨ A'' = A) ⊦ ◇ □ A'' = A;

   
end enrich