milestone in basic_2 with additions in static_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 66fb5e30c9db52626deb2aaafa8994454cb793c5..a5c53bf3e17a212da07212849aec0276de36e8a5 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
@@ -27,6 +27,15 @@
    <table name="basic_2_sum"/>
 
    <subsection name="B">Stage "B"</subsection>
+   <news class="beta" date="2019 April 16.">
+         Extended (λδ-2) and restricted (λδ-1) 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.
    </news>