matita/matita/contribs/lambdadelta/basic_2/web/basic_2.ldw.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
   2
   3 <page xmlns="http://lambdadelta.info/"
   4       description = "\lambda\delta home page"
   5       title = "\lambda\delta home page"
   6       logo = "crux"
   7       head = "cic:/matita/lambdadelta/basic_2/ (core λδ version 2)"
   8 >
   9    <sitemap name="sitemap"/>
  10 <!--
  11    <section>System's Syntax and Behavior</section>
  12    <body>This is a summary of the "block structure"
  13          of the System's syntactic items and reductions.
  14    </body>
  15    <table name="basic_2_blk"/>
  16    <body>* In terms only.
  17          ** In terms and local environments only.
  18          *** In global environments only.
  19          **** Sort level k in terms only.
  20    </body>
  21 -->
  22
  23    <section4 name="summary">Summary of the Specification</section4>
  24    <body>Here is a numerical account of the specification's contents
  25          and its timeline.
  26    </body>
  27    <table name="basic_2_sum"/>
  28
  29    <subsection name="B">Stage "B"</subsection>
  30    <news class="gamma" date="2019 November 19.">
  31          λδ-2B is released.
  32    </news>
  33    <news class="beta" date="2019 September 3.">
  34          Applicability condition is now parametrized
  35          with a generic subset of numbers.
  36    </news>
  37    <news class="beta" date="2019 June 2.">
  38          Applicability condition parametrized
  39          with an initial interval of numbers
  40          allows λδ-2B to generalize both λδ-2A and λδ-1B.
  41    </news>
  42    <news class="beta" date="2019 April 16.">
  43          Extended (λδ-2A) and restricted (λδ-1B) validity is decidable
  44          (anniversary milestone).
  45    </news>
  46    <news class="beta" date="2019 March 25.">
  47          Preservation of validity for rt-computation
  48          does not need the sort degree parameter
  49          (i.e. no induction on the degree).
  50    </news>
  51    <news class="beta" date="2018 November 1.">
  52          Extended (λδ-2A) and restricted (λδ-1B) validity rules justified.
  53    </news>
  54    <news class="alpha" date="2018 September 21.">
  55          λδ-2A completed with
  56          confluence of rt-computation and
  57          preservation of validity for rt-computation.
  58    </news>
  59    <news class="alpha" date="2018 June 8.">
  60          Behavioral component rt_computation completed.
  61    </news>
  62    <news class="alpha" date="2018 April 16.">
  63          "Big tree" theorem
  64          (anniversary milestone).
  65    </news>
  66    <news class="alpha" date="2018 March 9.">
  67          Support for rt-computation completed.
  68    </news>
  69    <news class="alpha" date="2017 October 17.">
  70          Exclusion binder in local environments.
  71          Syntactic component updated:
  72          syntax, relocation, s_transition, s_computation, static, i_static.
  73    </news>
  74    <news class="alpha" date="2017 April 16.">
  75          Strong rt-normalization
  76          for simply typed terms
  77          (anniversary milestone).
  78    </news>
  79    <news class="alpha" date="2017 March 16.">
  80          Behavioral component rt_transition completed.
  81    </news>
  82    <news class="alpha" date="2017 February 19.">
  83          Generic candidates of reducibility.
  84    </news>
  85    <news class="alpha" date="2017 January 17.">
  86          Confluence for parallel r-transition on referred entries of local environments.
  87    </news>
  88    <news class="alpha" date="2016 September 15.">
  89          Confluence for context-sensitive parallel r-transition on terms.
  90    </news>
  91    <news class="alpha" date="2016 April 16.">
  92          Syntactic component completed:
  93          syntax, relocation, s_transition, s_computation, static
  94          (anniversary milestone).
  95    </news>
  96    <news class="alpha" date="2016 March 25.">
  97          Relocation with reference transforming maps (rtmap).
  98    </news>
  99    <news class="alpha" date="2015 October 9.">
 100          λδ-2B is started.
 101    </news>
 102
 103    <subsection name="A">Stage "A" </subsection>
 104    <news class="delta" date="2015 August 27.">
 105          λδ-2A appears too complex and is dismissed.
 106    </news>
 107    <news class="gamma" date="2014 October 28.">
 108          λδ-2A is released.
 109    </news>
 110    <news class="beta" date="2014 September 9.">
 111          Iterated static type assignment defined (more elegantly)
 112          as a primitive notion.
 113    </news>
 114    <news class="beta" date="2014 June 18.">
 115          Preservation of stratified native validity
 116          for context-sensitive computation on terms.
 117    </news>
 118    <news class="alpha" date="2014 June 9.">
 119          Strong qrst-normalization
 120          for simply typed terms.
 121    </news>
 122    <news class="alpha" date="2014 April 16.">
 123          Lazy equivalence on local environments
 124          added as q-step to rst-computation on closures
 125          (anniversary milestone).
 126    </news>
 127    <news class="alpha" date="2014 January 20.">
 128          Parametrized slicing on local environments
 129          comprises both versions of this operation
 130          (one from basic_1, the other used in basic_2 till now).
 131    </news>
 132    <news class="alpha" date="2013 August 7.">
 133          Passive support for global environments.
 134    </news>
 135    <news class="alpha" date="2013 July 27.">
 136          Reaxiomatized β-reductum as in rt-reduction.
 137    </news>
 138    <news class="alpha" date="2013 July 20.">
 139          Context-sensitive strong rt-normalization
 140          for simply typed terms.
 141    </news>
 142    <news class="alpha" date="2013 April 16.">
 143          Reaxiomatized substitution and reduction
 144          commute with respect to subclosure
 145          (anniversary milestone).
 146    </news>
 147    <news class="alpha" date="2013 March 16.">
 148          Mutual recursive preservation of stratified native validity
 149          for rst-computation on closures.
 150    </news>
 151    <news class="alpha" date="2012 October 16.">
 152          Confluence for context-free parallel reduction on closures.
 153    </news>
 154    <news class="alpha" date="2012 July 26.">
 155          Term binders polarized to control ζ-reduction (not released).
 156    </news>
 157    <news class="alpha" date="2012 April 16.">
 158          Context-sensitive subject equivalence
 159          for atomic arity assignment
 160          (anniversary milestone).
 161    </news>
 162    <news class="alpha" date="2012 March 15.">
 163          Context-sensitive strong normalization
 164          for simply typed terms.
 165    </news>
 166    <news class="alpha" date="2012 January 27.">
 167          Generic candidates of reducibility.
 168    </news>
 169    <news class="alpha" date="2011 September 21.">
 170          Confluence for context-sensitive parallel reduction on terms.
 171    </news>
 172    <news class="alpha" date="2011 September 6.">
 173          Confluence for context-free parallel reduction on terms.
 174    </news>
 175    <news class="alpha" date="2011 April 17.">
 176          λδ-2A is started.
 177    </news>
 178
 179    <section4 name="structure">Logical Structure of the Specification</section4>
 180    <body>This table reports the specification's components and their planes.
 181    </body>
 182    <table name="basic_2_src"/>
 183
 184    <footer/>
 185 </page>