<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