head = "cic:/matita/lambdadelta/basic_2/ (core λδ version 2)"
>
<sitemap name="sitemap"/>
-<!--
+<!--
<section>System's Syntax and Behavior</section>
<body>This is a summary of the "block structure"
of the System's syntactic items and reductions.
<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="gamma" date="2019 November 19.">
+ λδ-2B is released.
+ </news>
+ <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-2A) and restricted (λδ-1B) validity rules justified.
+ </news>
+ <news class="alpha" date="2018 September 21.">
+ λδ-2A completed with
+ confluence of rt-computation and
+ preservation of validity for rt-computation.
+ </news>
+ <news class="alpha" date="2018 June 8.">
+ Behavioral component rt_computation completed.
+ </news>
+ <news class="alpha" date="2018 April 16.">
+ "Big tree" theorem
+ (anniversary milestone).
+ </news>
+ <news class="alpha" date="2018 March 9.">
+ Support for rt-computation completed.
+ </news>
+ <news class="alpha" date="2017 October 17.">
+ Exclusion binder in local environments.
+ Syntactic component updated:
+ syntax, relocation, s_transition, s_computation, static, i_static.
+ </news>
+ <news class="alpha" date="2017 April 16.">
+ Strong rt-normalization
+ for simply typed terms
+ (anniversary milestone).
</news>
-
- <subsection name="A2">Stage "A2": "Extending the Applicability Condition"</subsection>
-
<news class="alpha" date="2017 March 16.">
- First behavioral component reconstructed:
- rt_transition.
+ Behavioral component rt_transition completed.
</news>
<news class="alpha" date="2017 February 19.">
Generic candidates of reducibility.
Confluence for context-sensitive parallel r-transition on terms.
</news>
<news class="alpha" date="2016 April 16.">
- Syntactic component reconstructed:
+ Syntactic component completed:
syntax, relocation, s_transition, s_computation, static
(anniversary milestone).
</news>
Relocation with reference transforming maps (rtmap).
</news>
<news class="alpha" date="2015 October 9.">
- λδ version 2A2 is started.
+ λδ-2B is started.
</news>
- <subsection name="A1">Stage "A1": "Extending the Applicability Condition"</subsection>
+ <subsection name="A">Stage "A" </subsection>
+ <news class="delta" date="2019 November 20.">
+ λδ-2A is repackaged (was λδ-2A1).
+ </news>
<news class="delta" date="2015 August 27.">
- λδ version 2A1 appears too complex and is dismissed.
+ λδ-2A appears too complex and is dismissed.
</news>
<news class="gamma" date="2014 October 28.">
- λδ version 2A1 is released.
+ λδ-2A is released.
</news>
<news class="beta" date="2014 September 9.">
Iterated static type assignment defined (more elegantly)
</news>
<news class="alpha" date="2014 April 16.">
Lazy equivalence on local environments
- added as q-step to rst-computation on closures
+ added as q-step to rst-computation on closures
(anniversary milestone).
</news>
<news class="alpha" date="2014 January 20.">
- Parametrized slicing of local environments
- comprises both versions of this operation
- (one from basic_1, the other used in basic_2 till now).
+ Parametrized slicing on local environments
+ comprises both versions of this operation
+ (one from basic_1, the other used in basic_2 till now).
</news>
<news class="alpha" date="2013 August 7.">
Passive support for global environments.
Confluence for context-free parallel reduction on terms.
</news>
<news class="alpha" date="2011 April 17.">
- λδ version 2 is started.
+ λδ-2A is started.
</news>
<section4 name="structure">Logical Structure of the Specification</section4>