- <news date="2013 March 16.">
- Mutual recursive preservation of stratified native validity
- for "big tree" computation on closures.
+ <news class="beta" date="2019-03-25.">
+ 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="2018-11-01.">
+ Extended (λδ-2A) and restricted (λδ-1B) validity rules justified.
+ </news>
+ <news class="alpha" date="2018-09-21.">
+ λδ-2A completed with
+ confluence of rt-computation and
+ preservation of validity for rt-computation.
+ </news>
+ <news class="alpha" date="2018-06-08.">
+ Behavioral component rt_computation completed.
+ </news>
+ <news class="alpha" date="2018-04-16.">
+ "Big tree" theorem
+ (anniversary milestone).