<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 June 2.">
+ Parametrized applicability condition
+ allows λδ-2B to generalize both λδ-1A and λδ-1B.
+ </news>
+ <news class="beta" date="2019 April 16.">
+ Extended (λδ-2A) and restricted (λδ-1A) 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-1A) type rules justified.
</news>
--->
<news class="alpha" date="2018 September 21.">
λδ-2A completed with
confluence of rt-computation and