(* Title:  todo's for isac core

    Author: Walther Neuper 111013

    (c) copyright due to lincense terms.

 *)

 theory TODO

 imports "~~/src/Doc/Prog_Prove/LaTeXsugar"

 begin

 text \<open>

 Legend: here + code since 200120

   \<open>(*DOC\<close> identifies stuff dedicated for isac/Doc/Lucas_Interpreter

   \<open>(*?!?\<close> identifies a design question

 Distillation of "rounds of reforms":

   \<open>TODOs from current changesets\<close> \<rightarrow> \<open>Postponed from current changeset\<close> \<rightarrow>

   (*to be removed..*) \<rightarrow> \<open>Separated tasks\<close> (*.. to be removed*)

   \<rightarrow> subsection of \<open>Major reforms\<close>

 \<close>

 section \<open>TODOs from current changesets\<close>

 text\<open>

   Shift more complicated issues from  \<open>Current changeset\<close> to \<open>Postponed from current changeset\<close>

 \<close>

 subsection \<open>Current changeset\<close>

 text \<open>

   \begin{itemize}

   \item xxx          

   \item xxx

   \item xxx

   \item xxx          

   \item xxx          

   \item xxx

   \item xxx          

   \item rename (ist as {eval, ...}) -> (ist as {eval_rls, ...})

   \item xxx

   \item switch args

     check_tac cc ist (form_arg, prog_tac) to

     check_tac cc ist (prog_tac, form_arg)

   + in check_tac1

   \item xxx

   \item rm test/..--- check Scripts ---

   \item xxx

   \item reformat + rename "fun eval_leaf"+"fun get_stac"

         (*1*)(*2*)

         ?consistency with subst term?

   \item Tactic.Rewrite*': drop "bool"

   \item xxx

   \item exception PROG analogous to TERM

   \item xxx

   \item Prog_Tac: fun get_stac takes both Prog_Tac + Program --- wait for separate Tactical

     then shift into common descendant

     rename get_stac --> ?ptac?

   \item xxx

   \item separate code required in both, ProgLang & Interpret (e.g?)

   \item xxx

   \item /-------------------------------------------------------------------

   \item check occurences of KEStore_Elems.add_rlss [("list_rls",

   \item rename list_rls accordingly

   \item ------------------------------------------------------------------/

   \item xxx

   \item xxx

     \item signature LIBRARY_C

     \item Program.thy  (*=========== record these ^^^ in 'tacs' in program.ML =========*)

     \item sig/struc ..elems --> elem

     \item xxx

     \item xxx

     \end{itemize}

   \item xxx

   \item xxx

   \item distribute test/../scrtools.sml

   \item xxx

   \item xxx

   \item simplify calls of scan_dn1, scan_dn etc

   \item open Istate in LI

   \end{itemize}

 \<close>

 subsection \<open>Postponed from current changeset\<close>

 text \<open>

   \begin{itemize}

   \item xxx

   \item generate, generate1: NO thy as arg.

   \item xxx

   \item decompose do_next, by_tactic: mutual recursion only avoids multiple generate1

     ! ^^^ in find_next_step --- ? ? ? in locate_input_tactic ?

   \item xxx

   \item Generate.generate1 thy is redundant: is the same during pbl, thus lookup spec

   \item xxx

   \item NEW structure Step.applicable     Step.add

                           ^applicable_in      ^generate1

   \item xxx

   \item revise Pstate {or, ...}; strange occurrence in program without Tactical.Or documented here

   \item xxx

   \item shift tests into NEW model.sml (upd, upds_envv, ..)

   \item xxx

   \item xxx

   \item clarify handling of contexts

     \begin{itemize}

     \item xxx

     \item Specify/ works with thy | Interpret/ works with ctxt | MathEngine.step works with ?!?ctxt

     \item xxx

     \item Check_Elementwise "Assumptions": prerequisite for ^^goal

       rm tactic Check_elementwise "Assumptions" in a way, which keeps it for Minisubpbl

       rm Assumptions  :: bool  (* TODO: remove with making ^^^ idle *)

     \item xxx

     \item cleanup fun me:

       fun me (*(_, Empty_Tac) p _ _ = raise ERROR ("me:  Empty_Tac at " ^ pos'2str p)

         | me*) (_, tac) p _(*NEW remove*) pt =

       + -------------------------^^^^^^

     \item xxx

     \item remove ctxt from Tactic.T; this makes use of ctxt more explicit (e.g. in LI)

       \begin{itemize}

       \item Tactic.Apply_Method' (mI, _, _, _(*ctxt ?!?*))) .. remove ctxt

       \item rm ctxt from Subproblem' (is separated in associate!))

       \end{itemize}

     \item check Tactic.Subproblem': are 2 terms required?

     \item xxx

     \item Test_Some.--- rat-equ: remove x = 0 from [x = 0, x = 6 / 5] due to contexts --

       --: wait for deleting Check_Elementwise Assumptions

     \item xxx

     \item lucas-intrpreter.scan_dn1: Generate.generate1 (Celem.assoc_thy "Isac_Knowledge") 

     \end{itemize}

   \item xxx

   \item xxx

   \item complete mstools.sml (* survey on handling contexts:

   \item xxx

   \item xxx

   \item istate

     \begin{itemize}

     \item datatype L,R,D --> Istate

     \item xxx

     \item xxx

     \item xxx

     \item in locate_input_tactic .. ?scan_dn1?; Program.is_eval_expr   .use  Term.exists_Const

     \item xxx

     \item pstate2str --> pstate2str

     \item xxx

     \item after review of Rrls, detail ?-->? istate

     \item locate_input_tactic: get_simplifier cstate (*TODO: shift to init_istate*)

     \item xxx

     \item push srls into pstate

     \item lucas-intrpreter.locate_input_tactic: scan_to_tactic1 srls tac cstate (progr, Rule.e_rls)

                                                                                         ^^^^^^^^^^

     \item xxx

     \item xxx

     \end{itemize}

   \item xxx

   \item trace_script: replace ' by " in writeln

   \item xxx

   \item librarys.ml --> libraryC.sml + text from termC.sml

   \item xxx

   \item xxx

   \item xxx

   \item xxx

   \item xxx

   \item xxx

   \item concentrate "insert_assumptions" for locate_input_tactic in "associate", ?OR? Tactic.insert_assumptions

                                    DONE  for find_next_step by Tactic.insert_assumptions m' ctxt 

     \begin{itemize}

     \item rm from "generate1" ("Detail_Set_Inst'", Tactic.Detail_Set' ?)

     \item shift from "applicable_in..Apply_Method" to ? ? ? (is ONLY use-case in appl.sml))

     \item ?"insert_assumptions" necessary in "init_pstate" ?+++? in "applicable_in" ?+++? "associate"

     \item xxx

     \item xxx

     \item DO DELETIONS AFTER analogous concentrations in find_next_step

     \end{itemize}

   \item xxx

   \item ? what is the difference headline <--> cascmd in

     Subproblem' (spec, oris, headline, fmz_, context, cascmd)

   \item xxx

   \item inform: TermC.parse (Celem.assoc_thy "Isac_Knowledge") istr --> parseNEW context istr

   \item extract common code from associate.. stac2tac_

         rename LItool.stac2tac -> Tactic.from_prog_tac ? Solve_Tac.from_prog_tac,

         .. see \<open>Separate ..\<close>

   \end{itemize}

 \<close>

 section \<open>Separated tasks\<close>

 text \<open>

   This section shall be removed, because

   the distinction \<open>Simple\<close> | \<open>Simple but laborous\<close> | \<open>Questionable\<close>

   is too distracting when working \<open>TODOs from current changesets\<close>.

 \<close>

 subsection \<open>Simple\<close>

 text \<open>

   \begin{itemize}

   \item rm Float

   \item xxx

   \item check location of files:

         test/Tools/isac/Interpret/ptyps.thy

         test/Tools/isac/Specify.ptyps.sml

   \item xxx

   \item check occurences of Atools in src/ test/

   \item xxx

   \item drop  drop_questionmarks_

   \item xxx

   \item Const ("Atools.pow", _) ---> Const ("Base_Tool.pow", _) 

   \item rename   Base_Tool.thy  <---         Base_Tool

   \item xxx

   \item test/..  tools.sml, atools.sml, scrtools.sml ...

   \item xxx

   \item Diff.thy: differentiateX --> differentiate after removal of script-constant

   \item Test.thy: met_test_sqrt2: deleted?!

   \item xxx

   \item Applicable.applicable_in --> Applicable.tactic_at

   \item xxx

   \item adopt naming conventions in Knowledge: EqSystem --> Equation_System, etc

   \item xxx

   \item TermC.vars_of replace by vars (recognises numerals)

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Simple but laborous\<close>

 text \<open>

   \begin{itemize}

   \item prep_met

     \begin{itemize}

     \item rename field scr in meth

     \item xxx

     \item Rule.rew_ord' := overwritel (! Rule.rew_ord', (*<<<---- use KEStore.xxx, too*)

     \item xxx

     \item check match between args of partial_function and model-pattern of meth;

        provide error message.

     \item xxx

     \item automatically extrac rls from program-code 

       ? take ["SignalProcessing", "Z_Transform", "Inverse_sub"] as an example ?

     \item xxx

     \item xxx

     \item xxx

     \end{itemize}

   \item xxx

   \item drop "init_form" and use "Take" in programs (start with latter!)

   \item xxx

   \item deprive Check_elementwise, but keep it for Minisubpl

     (which checks for Check_Postcond separated by another tactic)

     This seems a prerequisite for appropriate handling of contexts at Check_Postcond.

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Questionable\<close>

 text \<open>

   \begin{itemize}

   \item finish output of trace_script with Check_Postcond (useful for SubProblem)

   \item unify in signature LANGUAGE_TOOLS =\\

     val pblterm: Rule.domID -> Celem.pblID -> term     vvv        vvv\\

     val subpbl: string -> string list -> term          unify with ^^^

   \item xxx

   \item Telem.safe is questionable: has it been replaced by Safe_Step, Not_Derivable, Helpless, etc?

     Note: replacement of Istate.safe by Istate.appy_ didn't care much about Telem.safe.

     If Telem.safe is kept, consider merge with CTbasic.ostate

   \item xxx

   \item remove find_next_step from solve Apply_Method';

     this enforces Pos.at_first_tactic, which should be dropped, too.

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 section \<open>Major reforms\<close>

 text \<open>

 \<close>

 subsection \<open>Exception Size raised\<close>

 text \<open>

   During update Isabelle2018 --> Isabelle2019 we noticed, that

   "isabelle build" uses resources more efficiently than "isabelle jedit".

   The former works, but the latter causes 

   \begin{itemize}

   \item "Exception- Size raised"

     in Build_Thydata.thy

   \item "exception Size raised (line 169 of "./basis/LibrarySupport.sml")"

     in test/../biegelinie-*.xml.

   \end{itemize}

   This has been detected after changeset (30cd47104ad7) "lucin: reorganise theories in ProgLang".

   Find tools to investigate the Exception, and find ways around it eventually.

 \<close>

 subsection \<open>Cleanup & review signatures wrt. implementation.pdf canonical argument order\<close>

 text \<open>

   \begin{itemize}

   \item there are comments in several signatures

   \item ML_file "~~/src/Tools/isac/Interpret/specification-elems.sml" can be (almost) deleted

   \item src/../Frontend/: signatures missing

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>overall structure of code\<close>

 text \<open>

   \begin{itemize}

   \item try to separate Isac_Knowledge from MathEngine

     common base: Knowledge_Author / ..??

   \item xxx

   \item  ML_file "~~/src/Tools/isac/Interpret/ctree.sml" (*shift to base in common with Interpret*)

   \item xxx

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>solve, loc_solve_, by_tactic, do_next, ...\<close>

 text \<open>

   unify to calcstate, calcstate', ?Calc.T?

   \begin{itemize}

   \item by_tactic Check_Postcond' needs NO 2.find_next_step

                  solve Check_Postcond' needs, because NO prog_result in Tactic.input

      and applicable_in cannot get it.

   \item xxx

   \item adopt the same for specification phase

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Separate MathEngineBasic/ Specify/ Interpret/ MathEngine/\<close>

 text \<open>

   \begin{itemize}

   \item xxx

   \item re-organise code for Interpret

     \begin{itemize}

     \item Step*:

       \begin{itemize}

       \item Step_Specify in Specify/step-specify.sml in analogy to Interpret/... TODO

         \begin{itemize}

         \item Step_Specify.check <-- Applicable.applicable_in

         \item Step_Specify.add   <-- Generate.generate1

         \item Step_Specify.do_next   : 

         \item Step_Specify.by_tactic :                     ? depending on PIDE

         \item Step_Specify.by_/// = Step_Specify.by_tactic ? depending on PIDE

         \end{itemize}

       \item Step_Solve in Interpret/step-solve.sml

         \begin{itemize}

         \item Step_Solve.check   <-- Applicable.applicable_in

           inserts all data into Tactic.T available -- not all are available at time of call!

         \item Step_Solve.add     <-- Generate.generate1

         \item Step_Solve.do_next   : 

         \item Step_Solve.by_tactic :

         \item Step_Solve.by_term   : term -> Calc.T -> ...stay as is

         \end{itemize}

       \item Step in MathEngine/step.sml

         \begin{itemize}

         \item Step.check     : Step_Specify.check      | Step_Solve.check      depending on pos'

           inserts all data into Tactic.T available -- not all are at time of call!

         \item Step.add       : Step_Specify.add        | Step_Solve.add        depending on pos'

         \item Step.do_next   : Step_Specify.find_next  | Step_Solve.find_next  depending on pos'

         \item Step.by_tactic : Step_Specify.by_tactic  | Step_Solve.by_tactic  depending on pos'

         \item                : Step_Specify.^^^^^^^^^  | Step_Solve.by_term

         \end{itemize}

       \item NOTE on mut.rec: Step.do_next calls Step_Solve.do_next + Step_Specify.do_next

                                                                     ^ Math_Engine.nxt_specify_

         so some restructuring is required.

         INTERMEDIATE STEP: Step.do_next is still Math_Engine.do_next

       \end{itemize}

     \item xxx

     \item xxx

     \end{itemize}

   \item xxx

   \item plan separate handling of tactics for Specify/ Interpret/    

     \begin{itemize}

     \item already prep. MathEngineBasic/tactic-def.sml + tactic.sml

     \item new: Specify/spec-tac.sml .. Interpret/solve-tac.sml: generate --> insert, etc

     \item reduce occurrences of "tactic" in TODO.thy

     \item xxx

     \end{itemize}

   \item xxx

   \item ??????????? WHY CAN LI.by_tactic NOT BE REPLACED BY Step_Solve.by_tactic ???????????

   \item xxx

   \item ..Separate:

     MathEngine.solve, ...,

     ? or identify "layers" like in Isabelle?

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Review modelling- + specification-phase\<close>

 text \<open>

   \begin{itemize}

   \item first do above "Separate MathEngineBasic/ Specify/ Interpret/ MathEngine/"

   \item xxx

   \item "--- hack for funpack: generalise handling of meths which extend problem items ---"

     \begin{itemize}

     \item see several locations of hack in code

     \item these locations are NOT sufficient, see

       test/../biegelinie-3.sml --- IntegrierenUndKonstanteBestimmen2: Bsp.7.70. auto ---

     \item "fun associate" "match_ags ..dI" instead "..pI" breaks many tests, however,

       this would be according to survey Notes (3) in src/../calchead.sml.

     \end{itemize}

   \item see "failed trial to generalise handling of meths"98298342fb6d

   \item abstract specify + nxt_specif to common aux-funs;

     see e.g. "--- hack for funpack: generalise handling of meths which extend problem items ---"

   \item xxx

   \item type model = itm list ?

   \item review survey Notes in src/../calchead.sml: they are questionable

   \item review copy-named, probably two issues commingled 

     \begin{itemize}

     \item special handling of "#Find#, because it is not a formal argument of partial_function

     \item special naming for solutions of equation solving: x_1, x_2, ...

     \end{itemize}

   \item xxx

   \item structure Tactic Specify -?-> Proglang (would require Model., Selem.)

   \item xxx

   \item this has been written in one go:

     \begin{itemize}

     \item reconsidering Model.max_vt, use problem with meth ["DiffApp","max_by_calculus"]

     \item reconsider add_field': where is it used for what? Shift into mk_oris

     \item reconsider match_itms_oris: where is it used for what? max_vt ONLY???

     \item in Specify_Method search root-oris for items (e.g. "errorBound"), #1# in survey

     \item Specify_Problem, Specify_Method: check respective identifiers after re-Specify_

       (relevant for pre-condition)

     \item unify match_ags to mk_oris1..N with different args (fmz | pat list, pbl | meth

     \item 

     \end{itemize}

   \end{itemize}

 \<close>

 subsection \<open>taci list, type step\<close>

 text \<open>

 taci was, most likely, invented to make "fun me" more efficient by avoiding duplicate rewrite,

 and probably, because the Kernel interface separated setNextTactic and applyTactic.

 Both are no good reasons to make code more complicated. For instance Math_Engine.do_next

 could drop half of the code. So try to use Calc.T only.

   \begin{itemize}

   \item xxx

   \item Step* functions should return Calc.T instead of Chead.calcstate'

   \item xxx

   \item states.sml: check, when "length tacis > 1"

   \item in Test_Isac.thy there is only 1 error in Interpret/inform.sml

   \item (*WN190713 REMOVE: "creating a new node" was never implemented for more than one node?!?

   \item xxx

   \item brute force setting all empty ([], [], ptp) but ptp causes errors -- investigate!

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Ctree\<close>

 text \<open>

   \begin{itemize}

   \item review get_ctxt, update_ctxt, get_istate, upd_istate, upd_ctxt,

     <---> update_loc', repl_loc (remove the latter)

   \item delete field ctxt in PblObj in favour of loc

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>replace theory/thy by context/ctxt\<close>

 text \<open>

   \begin{itemize}

   \item xxx

   \item Specify/ works with thy | Interpret/ works with ctxt | MathEngine.step works with ?!?ctxt

     special case: Tactic.Refine_Problem

   \item xxx

   \item theory can be retrieved from ctxt by Proof_Context.theory_of

   \item xxx

   \item cleaup the many conversions string -- theory

   \item make dest_spec --> (theory, pblID, metID) ?+ common_subthy ?

   \item 1. Rewrite.eval_true_, then

     LItool.check_leaf, Rewrite.eval_prog_expr, Generate.generate1, LItool.stac2tac.

   \item fun associate

     let val thy = Celem.assoc_thy "Isac_Knowledge";(*TODO*)

   \item xxx

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Rfuns, Begin_/End_Detail', Rrls, Istate\<close>

 text \<open>

   \begin{itemize}

   \item removing from_pblobj_or_detail' causes many strange errors

   \item ^^^+ see from_pblobj_or_detail_thm, from_pblobj_or_detail_calc, ...

   \item xxx

   \item probably only "normal_form" seems to be needed

   \item deleted Rfuns in NEW "locate_input_tactic": no active test for "locate_rule"

     but that seems desirable

   \item ?how is the relation to reverse-rewriting ???

   \item "Rfuns" markers in test/../rational

   \item xxx

   \item datatype istate (Istate.T): remove RrlsState, pstate: use Rrls only for creating results beyond

     rewriting and/or respective intermediate steps (e.g. cancellation of fractions).

     Thus we get a 1-step-action which does NOT require a state beyond istate/pstate.

     Thus we drastically reduce complexity, also get rid of "fun from_pblobj_or_detail_calc" , etc.

   \item debug ^^^ related: is there an occurence of Steps with more than 1 element?

   \item xxx

   \item and do_next (* WN1907: ?only for Begin_/End_Detail' DEL!!!*)

   \item xxx

   \item shouldn't go Rfuns from Rewrite --> Rewrite_Set; they behave similar to "fun interSteps" ?

   \end{itemize}

 \<close>

 subsection \<open>Inverse_Z_Transform.thy\<close>

 text \<open>

   \begin{itemize}

   \item\label{new-var-rhs} rule1..6, ruleZY introduce new variables on the rhs of the rewrite-rule.

   ? replace rewriting with substitution ?!?

   The problem is related to the decision of typing for "d_d" and making bound variables free (while

   shifting specific handling in equation solving etc. to the meta-logic). 

   \item Find "stepResponse (x[n::real]::bool)" is superfluous, because immediately used by

     rewrite-rules; see \ref{new-var-rhs}.

   \item Reconsider whole problem:

     input only the polynomial as argument of partial_function, in ([1], Frm) compile lhs "X z" ?

   \end{itemize}

 \<close>

 subsection \<open>Adopt Isabelle's numerals for Isac\<close>

 text \<open>

   \begin{itemize}

   \item replace numerals of type "real" by "nat" in some specific functions from ListC.thy

     and have both representations in parallel for "nat".

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Auto_Prog\<close>

 text \<open>

 two issues:

 (1) fun prep_rls creates a Program with too general and wrong types.

 (2) generated Programs (huge since strings are coded in ASCII) stored in rls drives

     Build_Thydata towards limits of resources.

   \begin{itemize}

   \item rename Auto_Prog.prep_rls --> Auto_Prog.generate

   \item Auto_Prog.generate : term -> rls -> (*Program*)term

      Ctree.current_formula---^^^^

   \item xxx

   \item xxx

   \item generate Program on demand in from_pblobj_or_detail'

   \item xxx

   \item xxx

   \end{itemize}

 \<close>

 subsection \<open>Redesign thms for equation solver\<close>

 text \<open>

   Existing solver is structured along the WRONG assumption,

   that Poly.thy must be the LAST thy among all thys involved.

   Preliminary solution: all inappropriately located thms are collected in Base_Tools.thy

 \<close>

 subsection \<open>Finetunig required for xmldata\<close>

 text \<open>

   See xmldata https://intra.ist.tugraz.at/hg/isac/rev/5b222a649390

   and in kbase html-representation generated from these xmldata.

   Notes in ~~/xmldata/TODO.txt.

 \<close>

 section \<open>Hints for further development\<close>

 text \<open>

 \<close>

 subsection \<open>Coding standards & some explanations for math-authors\<close>

 text \<open>copy from doc/math-eng.tex WN.28.3.03

 WN071228 extended\<close>

 subsubsection \<open>Identifiers\<close>

 text \<open>Naming is particularily crucial, because Isabelles name space is global, and isac does

   not yet use the novel locale features introduces by Isar. For instance, {\tt probe} sounds

   reasonable as (1) a description in the model of a problem-pattern, (2) as an element of the

   problem hierarchies key, (3) as a socalled CAS-command, (4) as the name of a related script etc.

   However, all the cases (1)..(4) require different typing for one and the same

   identifier {\tt probe} which is impossible, and actually leads to strange errors

   (for instance (1) is used as string, except in a script addressing a Subproblem).

   These are the preliminary rules for naming identifiers>

   \begin{description}

   \item [elements of a key] into the hierarchy of problems or methods must not contain

     capital letters and may contain underscrores, e.g. {\tt probe, for_polynomials}.

   \item [descriptions in problem-patterns] must contain at least 1 capital letter and

     must not contain underscores, e.g. {\tt Probe, forPolynomials}.

   \item [CAS-commands] follow the same rules as descriptions in problem-patterns above, thus

     beware of conflicts~!

   \item [script identifiers] always end with {\tt Program}, e.g. {\tt ProbeScript}.

   \item [???] ???

   \item [???] ???

   \end{description}

 %WN071228 extended\<close>

 subsubsection \<open>Rule sets\<close>

 text \<open>The actual version of the coding standards for rulesets is in {\tt /IsacKnowledge/Atools.ML

   where it can be viewed using the knowledge browsers.

   There are rulesets visible to the student, and there are rulesets visible (in general) only for

   math authors. There are also rulesets which {\em must} exist for {\em each} theory;

   these contain the identifier of the respective theory (including all capital letters) 

   as indicated by {\it Thy} below.

   \begin{description}

   \item [norm\_{\it Thy}] exists for each theory, and {\em efficiently} calculates a

     normalform for all terms which can be expressed by the definitions of the respective theory

     (and the respective parents).

   \item [simplify\_{\it Thy}] exists for each theory, and calculates a normalform for all terms

     which can be expressed by the definitions of the respective theory (and the respective parents)

     such, that the rewrites can be presented to the student.

   \item [calculate\_{\it Thy}] exists for each theory, and evaluates terms with 

     numerical constants only (i.e. all terms which can be expressed by the definitions of

     the respective theory and the respective parent theories). In particular, this ruleset includes

     evaluating in/equalities with numerical constants only.

     WN.3.7.03: may be dropped due to more generality: numericals and non-numericals

     are logically equivalent, where the latter often add to the assumptions

     (e.g. in Check_elementwise).

   \end{description}

   The above rulesets are all visible to the user, and also may be input; 

   thus they must be contained in {\tt Theory_Data} (KEStore_Elems.add_rlss,

   KEStore_Elems.get_rlss). All these rulesets must undergo a preparation

   using the function {\tt prep_rls'}, which generates a script for stepwise rewriting etc.

   The following rulesets are used for internal purposes and usually invisible to the (naive) user:

   \begin{description}

   \item [*\_erls] TODO

   \item [*\_prls] 

   \item [*\_srls] 

   \end{description}

 {\tt Rule.append_rls, Rule.merge_rls, remove_rls} TODO

 \<close>

 subsection \<open>get proof-state\<close>

 text \<open>

   Re: [isabelle] Programatically get "this"

   ----------------------------------------------------

   So here is my (Makarius') version of your initial example, following these principles:

   begin{verbatim}

     notepad

     begin

       assume a: A

       ML_val \<open>

         val ctxt = @{context};

         val this_name =

           Name_Space.full_name (Proof_Context.naming_of ctxt) (Binding.name Auto_Bind.thisN);

         val this = #thms (the (Proof_Context.lookup_fact ctxt this_name));

       \<close>

     end

   end{verbatim}

 \<close>

 subsection \<open>write Specification to jEdit\<close>

 text \<open>

   Re: [isabelle] Printing terms with type annotations

   ----------------------------------------------------

   On 06/02/2019 17:52, Moa Johansson wrote:

   >

   > I’m writing some code that should create a snippet of Isar script.

   This is how Sledgehammer approximates this:

   http://isabelle.in.tum.de/repos/isabelle/file/Isabelle2018/src/HOL/Tools/Sledgehammer/sledgehammer_isar_proof.ML#l299

   (The module name already shows that the proper terminology is "Isar

   proof" (or "Isar proof text").  Proof scripts are a thing from the past,

   before Isar. You can emulate old-style proof scripts via a sequence of

   'apply' commands, but this is improper Isar.)

   Note that there is no standard function in Isabelle/Pure, because the

   problem to print just the right amount of type information is very

   complex and not fully solved. One day, after 1 or 2 rounds of

   refinements over the above approach, it might become generally available.

 \<close>

 subsection \<open>follow Isabelle conventions (*Does not yet work in Isabelle2018\<close>

 text \<open>

   isabelle update -u path_cartouches

   isabelle update -u inner_syntax_cartouches

 \<close>

 section \<open>Questions to Isabelle experts\<close>

 text \<open>

 \begin{itemize}

 \item what is the actual replacement of "hg log --follow" ?

 \item xxx

 \item how HANDLE these exceptions, e.g.:

     Syntax.read_term ctxt "Randbedingungen y 0 = (0::real), y L = 0, M_b 0 = 0, M_b L = 0]"

   GIVES

     "Inner syntax error

      Failed to parse term"

 \item xxx

 \item how cope with "exception Size raised (line 171 of "./basis/LibrarySupport.sml")"

   e.g. in test/Interpret/lucas-interpreter.sml

 \item xxx

 \item xxx

 \end{itemize}

 \<close>

 section \<open>For copy & paste\<close>

 text \<open>

 \begin{itemize}

 \item xxx

   \begin{itemize}

   \item xxx

     \begin{itemize}

     \item xxx

       \begin{itemize}

       \item xxx

         \begin{itemize}

         \item xxx

         \end{itemize}

       \end{itemize}

     \end{itemize}

   \end{itemize}

 \end{itemize}

 \<close>

 subsection \<open>xxx\<close>

 subsubsection \<open>xxx\<close>

 end