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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
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15 include "basic_2/static/steq.ma".
17 (* STRATIFIED EQUIVALENCE FOR TERMS *****************************************)
19 (* Main properties **********************************************************)
21 theorem steq_trans: ∀h,g. Transitive … (steq h g).
23 #k1 #k #Hk1 #HK2 #X #H elim (steq_inv … H) -H /2 width=1 by steq_zero/
24 * /2 width=1 by steq_zero/