X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fwww%2Flambdadelta%2Fweb%2Fhome%2Fspecification.ldw.xml;h=969e3fd004acbf792c91ab4910b29f5683f01a07;hb=bc389dd4724959688aafc1ede450794f47b8d0b5;hp=815f9f34ab17a5928af344296bda1a293ae44cc8;hpb=636db4e12452d2ebce318b36cf5c41d30e4d9c29;p=helm.git diff --git a/helm/www/lambdadelta/web/home/specification.ldw.xml b/helm/www/lambdadelta/web/home/specification.ldw.xml index 815f9f34a..969e3fd00 100644 --- a/helm/www/lambdadelta/web/home/specification.ldw.xml +++ b/helm/www/lambdadelta/web/home/specification.ldw.xml @@ -3,21 +3,58 @@ - Computer-checked formal specifications + Computer-checked formal specifications - λδ is developed as a machine-checked digital specification. - It comes in several versions listed in the next table, - which includes the major milestones: + The systems of the λδ family are developed as machine-checked digital specifications, + and are listed in the next table, which includes the major milestones. + + + The life cycle of a specification consists of four periods. + + the definitions are designed and the major propositions are proved, + then the calculus is announced with a presentation. + + major changes and additions may occur before the calculus is released on paper. + + subsequent improvements occur until the specification is completed or superseded, + while major changes and additions are announced and reported on paper. + + after its conclusion, the specification is modified just for maintenance. + + Informational pages on the specifications are provided. + + + + nodes are counted according to the "intrinsic complexity measure" + [F. Guidi: "Procedural Representation of CIC Proof Terms" + Journal of Automated Reasoning 44(1-2), Springer (February 2010), pp. 53-78]. + + + + from the logical standpoint, the source scripts are grouped in "planes" + and these are grouped in "components"; + the notation for the relations or functions + introduced in each script, is shown in parentheses (? are placeholders). + + + + + λδ version 3 (proposed) + + The formal specification of λδ version 3 + is forthcoming. + + - λδ version 2 (in progress) + λδ version 2 (active) The formal specification of λδ version 2 is available in the following formats: @@ -25,12 +62,17 @@ - lambdadelta_2 for Matita 0.99.2 - (revised ). + lambdadelta_2A1 for Matita 0.99.2 + (revised ). Source scripts. + Documentation (R2c). - compile with the latest version of Matita from + The scripts are grouped in directories, first by part, then by component. + + + + the scripts are checked by the latest version of Matita from HELM Subversion repository at path <trunk/matita/>. @@ -45,21 +87,31 @@ - λδ version 1 (dismissed) + λδ version 1 (superseded) The formal specification of λδ version 1 is available in the following formats: - lambdadelta_1 for Coq 7.3.1 - (revised ). - Source scripts. + + lambdadelta_1 for Coq 7.3.1 + (revised ). + Source scripts. + Documentation (J1a). + + + 17 new lemmas and former lemma "eq_nat_dec" renamed as "nat_dec_neg". + + + + The scripts are grouped in directories, one for each part. + - lambdadelta_1 for Matita 0.5" - (revised ). + lambdadelta_1 for Matita 0.5 + (revised ). Static HTML pages generated by the HELM rendering engine. @@ -85,11 +137,17 @@ - lambdadelta_1 for Matita 0.5" - (revised ). + lambdadelta_1 for Matita 0.5 + (revised ). HELM directory. - + + + Informational pages on the parts of the specification: + Background, + Core. + +