--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| The HELM team. *)
+(* ||A|| http://helm.cs.unibo.it *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU General Public License Version 2 *)
+(* *)
+(**************************************************************************)
+
+include "ground/counters/rtc_shift.ma".
+include "ground/counters/rtc_ism.ma".
+
+(* T-BOUND RT-TRANSITION COUNTERS *******************************************)
+
+(* Constructions with rtc_shift *********************************************)
+
+lemma rtc_isr_shift (c): ๐โช๐,cโซ โ ๐โช๐,โ*cโซ.
+#c * #ri #rs #H destruct /2 width=3 by ex1_2_intro/
+qed.
+
+(* Inversions with rtc_shift ************************************************)
+
+lemma rtc_ism_inv_shift (n) (c): ๐โชn,โ*cโซ โ โงโง ๐โช๐,cโซ & ๐ = n.
+#n #c * #ri #rs #H
+elim (rtc_shift_inv_dx โฆ H) -H #rt0 #rs0 #ti0 #ts0 #_ #_ #H1 #H2 #H3
+elim (eq_inv_nmax_zero โฆ H1) -H1 /3 width=3 by ex1_2_intro, conj/
+qed-.
+
+lemma rtc_isr_inv_shift (c): ๐โช๐,โ*cโซ โ ๐โช๐,cโซ.
+#c #H elim (rtc_ism_inv_shift โฆ H) -H //
+qed-.