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(* GNU General Public License for more details.                       *)
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(* 02110-1301 USA                                                     *)

Theorem subs_var_after_subs_par_name :
forall (n : name) (p q : PP) (x : VV),
n <> vname x ->
subs_var_name (subs_par_name n (vname x) p) (pname q) x =
subs_par_name n (pname q) p.