\lambda\delta home page

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- home -	- news -	- documentation -	- specification -	- -	- implementation -
- foreword -	- milestones -	- version 2 -	- version 2 -	(background - core - applications)	- library -
- notice -	- visibility -	- version 1 -	- version 1 -	- -	- helena -

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- Î»Î´ is developed as a machine-checked digital specification. - It comes in several versions listed in the next table, - which includes the major milestones: -

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version	name	developed with	stage	started	announced	released	dismissed
- Version 2 -	"basic_2"	- Matita 0.99.2 -	"A"	April 2011	June 2014	Planned in October 2014	Not planned yet
- Version 1 -	"basic_1"	- Coq 7.3.1 -	-	May 2004	December 2005	November 2006	May 2008

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+\lambda\delta home page

$[\lambda\delta home]$

The Formal Systems of the Î»Î´ (\lambda\delta) Family

$\lambda\delta rainbow rule$

home	news	specification			documentation	implementation
foreword	milestones	version 2	(background - core - applications)		version 2	helena	Open Symbolic Notation (OSN)
citations	visibility	version 1	(background - core)	(static HELM directory)	version 1	library	(static LDDL directory)

Computer-checked formal specifications $\lambda\delta butterfly$

+ The systems of the Î»Î´ 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. + Alpha: + the definitions are designed and the major propositions are proved, + then the calculus is announced with a presentation. + Beta: + major changes and additions may occur before the calculus is released on paper. + Gamma: + subsequent improvements occur until the specification is completed or superseded, + while major changes and additions are announced and reported on paper. + Delta: + after its conclusion, the specification is modified just for maintenance. +

version	name	stage	developed with	started	announced	released	concluded	references
Version 3	"basic_3"							J3a
Version 2	"basic_2"	"A2"	Matita 0.99.3	October 2015
		"A1"	Matita 0.99.2	April 2011	June 2014	October 2014	August 2015	V2a R2c
Abandoned			Coq 7.3.1	March 2008			February 2011
Version 1	"basic_1"		Coq 7.3.1	May 2004	December 2005	November 2006	May 2008	V1a J1a

+ Informational pages on the specifications are provided. +

Notice on displayed numerical acounts: + 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]. +

Notice on displayed logical structures: + 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). +

$\lambda\delta butterfly$ Î»Î´ version 3 (proposed)

+ The formal specification of Î»Î´ version 3 + is forthcoming. +

$\lambda\delta butterfly$ Î»Î´ version 2 (active)

The formal specification of Î»Î´ version 2 is available in the following formats: -

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- lambdadelta_2 for Matita 0.99.2 - (revised 2014-10). - Source scripts. -

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lambdadelta_2A1 for Matita 0.99.2 + (revised 2014-10). + Source scripts. + Documentation (R2c). +
+ The scripts are grouped in directories, first by part, then by component. +
Notice: + the scripts are checked by the latest version of Matita from + HELM Subversion repository + at path <trunk/matita/>. +

Informational pages on the parts of the specification: Background, Core, Applications. -

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Î»Î´ version 1 (dismissed)

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$\lambda\delta butterfly$ Î»Î´ version 1 (superseded)