(* equations and functions; functions NOT as lambda-terms

    author: Walther Neuper 2005, 2006

    (c) due to copyright terms

 *)

 theory Equation imports Atools begin

 consts

   (*descriptions in the related problems TODOshift here from Descriptions.thy*)

   substitution      :: "bool => una"

   (*the CAS-commands*)

   solve             :: "[bool * 'a] => bool list" (* solve (x+1=2, x) *)

   solveTest         :: "[bool * 'a] => bool list" (* for test collection *)

   (*Script-names*)

   Function2Equality :: "[bool, bool,       bool] 

 					 => bool"

                   ("((Script Function2Equality (_ _ =))// (_))" 9)

 text {* defines equation and univariate-equation

         created by: rlang 

               date: 02.09

         changed by: rlang

         last change by: rlang

                   date: 02.11.29

         (c) by Richard Lang, 2003 *}

 ML {*

 val univariate_equation_prls = 

     append_rls "univariate_equation_prls" e_rls 

 	       [Calc ("Tools.matches",eval_matches "")];

 ruleset' := 

 overwritelthy @{theory} (!ruleset',

 		   [("univariate_equation_prls",

 		     prep_rls univariate_equation_prls)]);

 store_pbt 

  (prep_pbt (theory "Equation") "pbl_equ" [] e_pblID

  (["equation"],

   [("#Given" ,["equality e_","solveFor v_"]),

    ("#Where" ,["matches (?a = ?b) e_"]),

    ("#Find"  ,["solutions v_i_"])

   ],

   append_rls "equation_prls" e_rls 

 	     [Calc ("Tools.matches",eval_matches "")],

   SOME "solve (e_::bool, v_)",

   []));

 store_pbt

  (prep_pbt (theory "Equation") "pbl_equ_univ" [] e_pblID

  (["univariate","equation"],

   [("#Given" ,["equality e_","solveFor v_"]),

    ("#Where" ,["matches (?a = ?b) e_"]),

    ("#Find"  ,["solutions v_i_"])

   ],

   univariate_equation_prls,SOME "solve (e_::bool, v_)",[]));

 (*.function for handling the cas-input "solve (x+1=2, x)":

    make a model which is already in ptree-internal format.*)

 (* val (h,argl) = strip_comb (str2term "solve (x+1=2, x)");

    val (h,argl) = strip_comb ((term_of o the o (parse thy)) 

 				  "solveTest (x+1=2, x)");

    *)

 fun argl2dtss [Const ("Pair", _) $ eq $ bdv] =

     [((term_of o the o (parse thy)) "equality", [eq]),

      ((term_of o the o (parse thy)) "solveFor", [bdv]),

      ((term_of o the o (parse thy)) "solutions", 

       [(term_of o the o (parse thy)) "L"])

      ]

   | argl2dtss _ = raise error "Equation.ML: wrong argument for argl2dtss";

 castab := 

 overwritel (!castab, 

 	    [((term_of o the o (parse thy)) "solveTest", 

 	      (("Test.thy", ["univariate","equation","test"], ["no_met"]), 

 	       argl2dtss)),

 	     ((term_of o the o (parse thy)) "solve",  

 	      (("Isac.thy", ["univariate","equation"], ["no_met"]), 

 	       argl2dtss))

 	     ]);

 store_met

     (prep_met (theory "Equation") "met_equ" [] e_metID

 	      (["Equation"],

 	       [],

 	       {rew_ord'="tless_true", rls'=Erls, calc = [], 

 		srls = e_rls, 

 		prls=e_rls,

 	     crls = Atools_erls, nrls = e_rls},

 "empty_script"

 ));

 *}

 end