<page xmlns="http://lambdadelta.info/"
description = "\lambda\delta home page"
title = "\lambda\delta home page"
+ logo = "crux"
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.
-->
<section4 name="summary">Summary of the Specification</section4>
- <body>Here is a numerical acount of the specification's contents
+ <body>Here is a numerical account of the specification's contents
and its timeline.
</body>
<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="2020-12-08.">
+ λδ-2B is repackaged for publication.
</news>
-
- <subsection name="A">Stage "A": "Extending the Applicability Condition"</subsection>
- <news class="gamma" date="2014 October 28.">
- λδ version 2A is released.
+ <news class="gamma" date="2020-09-25.">
+ Improved theory of rst-transition.
+ </news>
+ <news class="gamma" date="2020-04-16.">
+ Sort hierarchy parameter removed from unbound rt-transition
+ (anniversary milestone).
+ </news>
+ <news class="gamma" date="2020-02-27.">
+ λδ-2B is repackaged without λδ-ground.
</news>
- <news class="beta" date="2014 September 9.">
- Iterated static type assignment defined (more elegantly)
- as a primitive notion.
+ <news class="gamma" date="2019-11-19.">
+ λδ-2B is released.
</news>
- <news class="beta" date="2014 June 18.">
- Preservation of stratified native validity
- for context-sensitive computation on terms.
+ <news class="beta" date="2019-09-03.">
+ Applicability condition is now parametrized
+ with a generic subset of numbers.
</news>
- <news class="alpha" date="2014 June 9.">
- Strong qrst-normalization
- for simply typed terms.
+ <news class="beta" date="2019-06-02.">
+ Applicability condition parametrized
+ with an initial interval of numbers
+ allows λδ-2B to generalize both λδ-2A and λδ-1B.
</news>
- <news class="alpha" date="2014 April 16.">
- Lazy equivalence on local environments
- addded as q-step to rst-computation on closures
+ <news class="beta" date="2019-04-16.">
+ Extended (λδ-2A) and restricted (λδ-1B) validity is decidable
(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).
+ <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="alpha" date="2013 August 7.">
- Passive support for global environments.
+ <news class="beta" date="2018-11-01.">
+ Extended (λδ-2A) and restricted (λδ-1B) validity rules justified.
</news>
- <news class="alpha" date="2013 July 27.">
- Reaxiomatized β-reductum as in rt-reduction.
+ <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="2013 July 20.">
- Context-sensitive strong rt-normalization
- for simply typed terms.
+ <news class="alpha" date="2018-06-08.">
+ Behavioral component rt_computation completed.
</news>
- <news class="alpha" date="2013 April 16.">
- Reaxiomatized substitution and reduction
- commute with respect to subclosure
+ <news class="alpha" date="2018-04-16.">
+ "Big tree" theorem
(anniversary milestone).
</news>
- <news class="alpha" date="2013 March 16.">
- Mutual recursive preservation of stratified native validity
- for rst-computation on closures.
+ <news class="alpha" date="2018-03-09.">
+ Support for rt-computation completed.
</news>
- <news class="alpha" date="2012 October 16.">
- Confluence for context-free parallel reduction on closures.
+ <news class="alpha" date="2017-10-17.">
+ Exclusion binder in local environments.
+ Syntactic component updated:
+ syntax, relocation, s_transition, s_computation, static, i_static.
</news>
- <news class="alpha" date="2012 July 26.">
- Term binders polarized to control ζ-reduction (not released).
- </news>
- <news class="alpha" date="2012 April 16.">
- Context-sensitive subject equivalence
- for atomic arity assignment
+ <news class="alpha" date="2017-04-16.">
+ Strong rt-normalization
+ for simply typed terms
(anniversary milestone).
</news>
- <news class="alpha" date="2012 March 15.">
- Context-sensitive strong normalization
- for simply typed terms.
+ <news class="alpha" date="2017-03-16.">
+ Behavioral component rt_transition completed.
+ </news>
+ <news class="alpha" date="2017-02-19.">
+ Generic candidates of reducibility.
</news>
- <news class="alpha" date="2012 January 27.">
- Support for abstract candidates of reducibility.
+ <news class="alpha" date="2017-01-17.">
+ Confluence for parallel r-transition on referred entries of local environments.
</news>
- <news class="alpha" date="2011 September 21.">
- Confluence for context-sensitive parallel reduction on terms.
+ <news class="alpha" date="2016-09-15.">
+ Confluence for context-sensitive parallel r-transition on terms.
+ </news>
+ <news class="alpha" date="2016-04-16.">
+ Syntactic component completed:
+ syntax, relocation, s_transition, s_computation, static
+ (anniversary milestone).
</news>
- <news class="alpha" date="2011 September 6.">
- Confluence for context-free parallel reduction on terms.
+ <news class="alpha" date="2016-03-25.">
+ Relocation with reference transforming maps (rtmap).
</news>
- <news class="alpha" date="2011 April 17.">
- Specification starts.
+ <news class="alpha" date="2015-10-09.">
+ λδ-2B is started.
</news>
<section4 name="structure">Logical Structure of the Specification</section4>
projects / helm.git / blobdiff