update in basic_2

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / web / basic_2.ldw.xml

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 ffb7cbb90d332fc4cbc01daee40aca9ffcae9c0f..28575ff0ea587c7a0b377529bd7140048bd6c21e 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml
+++ b/matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml
@@ -27,12 +27,27 @@
    <table name="basic_2_sum"/>
 
    <subsection name="B">Stage "B"</subsection>
-<!-- 
-   <news class="alpha" date="Ongoing.">
-         Context-sensitive subject equivalence
-         for native type assignment.
+   <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-2A) and restricted (λδ-1B) validity rules justified.
    </news>
--->
    <news class="alpha" date="2018 September 21.">
          λδ-2A completed with
          confluence of rt-computation and
@@ -87,7 +102,7 @@
          λδ-2A appears too complex and is dismissed.
    </news>
    <news class="gamma" date="2014 October 28.">
-         λδ version 2A is released.
+         λδ-2A is released.
    </news>
    <news class="beta" date="2014 September 9.">
          Iterated static type assignment defined (more elegantly)