<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