X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground_2%2Fsteps%2Frtc_isrt.ma;h=9c988abea63f85bd33a65e7d05b191bfe96b1244;hb=138e01310a2334cd531819122c794d72d14c6e8c;hp=ced83577ac246dddcb5a4edaff326317b8606908;hpb=89ea663d91904f483f8248cfaeaed5eda8715da2;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_isrt.ma b/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_isrt.ma
index ced83577a..9c988abea 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_isrt.ma
+++ b/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_isrt.ma
@@ -34,6 +34,11 @@ lemma isr_10: ððâ¦0, ððâ¦.
 lemma isrt_01: ððâ¦1, ððâ¦.
 /2 width=3 by ex1_2_intro/ qed.
 
+lemma isrt_eq_t_trans: ân,c1,c2. ððâ¦n, c1â¦ â eq_t c1 c2 â ððâ¦n, c2â¦.
+#n #c1 #c2 * #ri1 #rs1 #H destruct
+#H elim (eq_t_inv_dx â¦ H) -H /2 width=3 by ex1_2_intro/
+qed-.
+
 (* Basic inversion properties ***********************************************)
 
 lemma isrt_inv_00: ân. ððâ¦n, ððâ¦ â 0 = n.
@@ -50,6 +55,10 @@ qed-.
 
 (* Main inversion properties ************************************************)
 
-theorem isrt_mono: ân1,n2,c. ððâ¦n1, câ¦ â ððâ¦n2, câ¦ â n1 = n2.
+theorem isrt_inj: ân1,n2,c. ððâ¦n1, câ¦ â ððâ¦n2, câ¦ â n1 = n2.
 #n1 #n2 #c * #ri1 #rs1 #H1 * #ri2 #rs2 #H2 destruct //
 qed-.
+
+theorem isrt_mono: ân,c1,c2. ððâ¦n, c1â¦ â ððâ¦n, c2â¦ â eq_t c1 c2.
+#n #c1 #c2 * #ri1 #rs1 #H1 * #ri2 #rs2 #H2 destruct //
+qed-.