Implementation

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Add map_cong?? (upto 10% slower)

a simp command for terms

Recdef: Get rid of function name in header.

Support mutual recursion (Konrad?)

improve solver in simplifier: treat & and ! ...

better 1 point rules:

!x. !y. x = f y --> P x y  should reduce to  !y. P (f y) y.

it would be nice if @term could deal with ?-vars.

then a number of (unchecked!) @texts could be converted to @terms.

it would be nice if one could get id to the enclosing quotes in the [source] option.

More predefined functions for datatypes: map?

Induction rules for int: int_le/ge_induct?

Needed for ifak example. But is that example worth it?

Komischerweise geht das Splitten von _Annahmen_ auch mit simp_tac, was

ein generelles Feature ist, das man vielleicht mal abstellen sollte.

proper mutual simplification

defs with = and pattern matching??

Minor fixes in the tutorial

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Appendix: Lexical: long ids.

Warning: infixes automatically become reserved words!

Syntax section: syntax annotations not just for consts but also for constdefs and datatype.

Appendix with list functions.

All theory sources on the web?

Possible exercises

==================

Exercises

For extensionality (in Sets chapter): prove

valif o norm = valif

in If-expression case study (Ifexpr)

Nested inductive datatypes: another example/exercise:

 size(t) <= size(subst s t)?

insertion sort: primrec, later recdef

OTree:

 first version only for non-empty trees:

 Tip 'a | Node tree tree

 Then real version?

 First primrec, then recdef?

Ind. sets: define ABC inductively and prove

ABC = {rep A n @ rep B n @ rep C n. True}

Partial rekursive functions / Nontermination:

Exercise: ?! f. !i. f i = if i=0 then 1 else i*f(i-1)

(What about sum? Is there one, a unique one?)

Exercise

Better(?) sum i = fst(while (%(s,i). i=0) (%(s,i). (s+i,i-1)) (0,i))

Prove 0 <= i ==> sum i = i*(i+1) via while-rule

Possible examples/case studies

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Trie: Define functional version

datatype ('a,'b)trie = Trie ('b option) ('a => ('a,'b)trie option)

lookup t [] = value t

lookup t (a#as) = case tries t a of None => None | Some s => lookup s as

Maybe as an exercise?

Trie: function for partial matches (prefixes). Needs sets for spec/proof.

Sets via ordered list of intervals. (Isa/Interval(2))

propositional logic (soundness and completeness?),

predicate logic (soundness?),

Tautology checker. Based on Ifexpr or prop.logic?

Include forward reference in relevant section.

Sorting with comp-parameter and with type class (<)

Recdef:more example proofs:

 if-normalization with measure function,

 nested if-normalization,

 quicksort

 Trie?

New book by Bird?

Steps Towards Mechanizing Program Transformations Using PVS by N. Shankar,

      Science of Computer Programming, 26(1-3):33-57, 1996. 

You can get it from http://www.csl.sri.com/scp95.html

J Moore article Towards a ...

Mergesort, JVM

Additional topics

=================

Recdef with nested recursion?

Extensionality: applications in

- boolean expressions: valif o bool2if = value

- Advanced datatypes exercise subst (f o g) = subst f o subst g

A look at the library?

Map.

Prototyping?

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