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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       head = "The Formal Systems of the λδ (\lambda\delta) Family"
7 >
8    <sitemap name="sitemap"/>
9
10    <section15 name="specifications">Computer-checked formal specifications</section15>
11    <body>
12       The systems of the λδ family are developed as machine-checked digital specifications,
13       and are listed in the next table, which includes the major milestones.
14    </body>
15    <body>
16       The life cycle of a specification consists of four periods.
17       <notice class="alpha" text="Alpha:"/>
18       the definitions are designed and the major propositions are proved,
19       then the calculus is announced with a presentation.
20       <notice class="beta" text="Beta:"/>
21       major changes and additions may occur before the calculus is released on paper.
22       <notice class="gamma" text="Gamma:"/>
23       subsequent improvements occur until the specification is completed or superseded,
24       while major changes and additions are announced and reported on paper.
25       <notice class="delta" text="Delta:"/>
26       after its conclusion, the specification is modified just for maintenance. 
27    </body>
28    <table name="versions"/>
29
30    <body>
31      Informational pages on the specifications are provided.
32    </body>
33    <topitem name="notice1">
34       <notice class="alpha" text="Notice on displayed numerical acounts:"/>
35       nodes are counted according to the "intrinsic complexity measure"
36       [F. Guidi: "Procedural Representation of CIC Proof Terms"
37       Journal of Automated Reasoning 44(1-2), Springer (February 2010), pp. 53-78].       
38    </topitem>
39    <topitem name="notice2">
40       <notice class="alpha" text="Notice on displayed logical structures:"/>
41       from the logical standpoint, the source scripts are grouped in "planes"
42       and these are grouped in "components";
43       the notation for the relations or functions
44       introduced in each script, is shown in parentheses (? are placeholders).
45    </topitem>
46
47 <!-- VERSION 2 =========================================================== -->
48
49    <subsection name="v2"><version2-icon/>λδ version 2 (active)</subsection>
50    <body>
51       The formal specification of λδ version 2
52       is available in the following formats:
53    </body>
54
55    <topitem name="source2">
56       <body>
57          <rlink to="download/lambdadelta_2A1.tar.gz">lambdadelta_2A1 for Matita 0.99.2</rlink>
58          (revised <notice class="gamma" text="2014-10"/>).
59          Source scripts.
60          <rlink to="documentation.html#ldR2c">Documentation (R2c)</rlink>.
61       </body>
62       <body>
63          The scripts are grouped in directories, first by part, then by component.
64       </body>
65       <body>
66          <notice class="alpha" text="Notice:"/>
67          the scripts are checked by the latest version of Matita from
68          <link to="http://matita.cs.unibo.it/download.shtml">HELM Subversion repository</link>
69          at path &lt;trunk/matita/&gt;.
70       </body>
71    </topitem>
72
73    <body>
74       Informational pages on the parts of the specification:
75       <rlink to="ground_2.html">Background</rlink>,
76       <rlink to="basic_2.html">Core</rlink>,
77       <rlink to="apps_2.html">Applications</rlink>.
78    </body>
79
80 <!-- VERSION 1 =========================================================== -->
81
82    <subsection name="v1"><version1-icon/>λδ version 1 (superseded)</subsection>
83    <body>
84       The formal specification of λδ version 1
85       is available in the following formats:
86    </body>
87
88    <topitem name="source1">
89       <body>
90          <rlink to="download/lambdadelta_1.tar.gz">lambdadelta_1 for Coq 7.3.1</rlink>
91          (revised <notice class="delta" text="2015-09"/>).
92          Source scripts.
93          <rlink to="documentation.html#ldJ1a">Documentation (J1a)</rlink>.
94          <list><item>
95             <notice class="delta" text="2015 January 15."/>
96             17 new lemmas and former lemma "eq_nat_dec" renamed as "nat_dec_neg".
97          </item></list>
98       </body>      
99       <body>
100          The scripts are grouped in directories, one for each part.
101       </body>
102    </topitem>
103
104    <topitem name="static1">
105       <rlink to="static/matita/lambdadelta/">lambdadelta_1 for Matita 0.5</rlink>
106       (revised <notice class="delta" text="2011-09"/>).
107       Static HTML pages generated by the <link to="http://helm.cs.unibo.it/">HELM</link> rendering engine.  
108       <list><item>
109          <rlink to="static/matita/lambdadelta/basic_1/pr3/pr3/pr3_confluence.con.html">
110             Confluence of reduction</rlink>
111          (Church-Rosser property).
112       </item><item>
113          <rlink to="static/matita/lambdadelta/basic_1/ty3/props/ty3_correct.con.html">
114             Correctness of types</rlink>.
115       </item><item>
116          <rlink to="static/matita/lambdadelta/basic_1/ty3/props/ty3_unique.con.html">
117             Uniqueness of types up to conversion</rlink>.
118       </item><item>
119          <rlink to="static/matita/lambdadelta/basic_1/ty3/pr3/ty3_sred_pr3.con.html">
120             Subject reduction of the type assignment</rlink>.
121       </item><item>
122          <rlink to="static/matita/lambdadelta/basic_1/ty3/arity_props/ty3_sn3.con.html">
123             Strong normalization of the typed terms</rlink>.
124       </item><item>
125          <rlink to="static/matita/lambdadelta/basic_1/ty3/dec/ty3_inference.con.html">
126             Decidability of the type inference problem</rlink>.
127       </item></list>
128    </topitem>
129
130    <topitem name="dynamic1">
131       <link to="http://mowgli.cs.unibo.it:58080/apply?keys=RT&amp;xmluri=http://helm.cs.unibo.it/helm//html/folder/index.html&amp;prop.media-type=text/html&amp;param.thmedia-type=text/html&amp;param.thkeys=T1%2CT2%2CL%2CE&amp;param.embedkeys=d_c%2CTC1%2CHC2%2CL&amp;param.thencoding=UTF-8&amp;prop.encoding=UTF-8&amp;prop.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&amp;param.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&amp;param.encoding=UTF-8&amp;param.media-type=text/html&amp;param.keys=d_c%2CC1%2CHC2%2CL&amp;profile=default&amp;param.profile=default&amp;param.CICURI=theory:/matita/lambdadelta/">
132          lambdadelta_1 for Matita 0.5</link>
133       (revised <notice class="delta" text="2011-09"/>).
134       <link to="http://helm.cs.unibo.it/">HELM</link> directory.
135       <notice class="alpha" text="Notice: the HELM rendering engine is offline."/>
136    </topitem>
137
138    <body>
139       Informational pages on the parts of the specification:
140       <rlink to="ground_1.html">Background</rlink>,
141       <rlink to="basic_1.html">Core</rlink>.
142    </body>
143
144    <footer/>
145 </page>