X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fweb%2Fbasic_2.ldw.xml;fp=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fweb%2Fbasic_2.ldw.xml;h=1be3304c95f9752a36c39238bca256f904f543e2;hb=db020b4218272e2e35641ce3bc3b0a9b3afda899;hp=66fb5e30c9db52626deb2aaafa8994454cb793c5;hpb=d8f6494f48aa08bb32d9d1ac82fc16e9e41b76ac;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml b/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml
index 66fb5e30c..1be3304c9 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml
+++ b/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml
@@ -27,8 +27,26 @@
    <table name="basic_2_sum"/>
 
    <subsection name="B">Stage "B"</subsection>
+   <news class="beta" date="2019 September 3.">
+         Applicability condition is now parametrized
+         with a generic subset of numbers.
+   </news>
+   <news class="beta" date="2019 June 2.">
+         Applicability condition parametrized
+         with an initial interval of numbers
+         allows λδ-2B to generalize both λδ-2A and λδ-1B.
+   </news>
+   <news class="beta" date="2019 April 16.">
+         Extended (λδ-2A) and restricted (λδ-1B) validity is decidable
+         (anniversary milestone).
+   </news>
+   <news class="beta" date="2019 March 25.">
+         Preservation of validity for rt-computation
+         does not need the sort degree parameter
+         (i.e. no induction on the degree).
+   </news>
    <news class="beta" date="2018 November 1.">
-         Extended (λδ-2) and restricted (λδ-1) type rules justified.
+         Extended (λδ-2A) and restricted (λδ-1A) type rules justified.
    </news>
    <news class="alpha" date="2018 September 21.">
          λδ-2A completed with