completed IdiomCat to compile api and math

lib/resource/mathematical/MathematicalCat.gf

@@ -0,0 +1,26 @@
+--# -path=.:present:prelude
+
+concrete MathematicalCat of Mathematical = 
+  NounCat - [ComplN2], --- to avoid ambiguity 
+--  VerbCat, 
+  AdjectiveCat,
+  AdverbCat,
+  NumeralCat,
+--  SentenceCat,
+  QuestionCat,
+  RelativeCat,
+  ConjunctionCat,
+  PhraseCat,
+  TextX - [Tense,TPres,TPast,TFut,TCond],
+  IdiomCat,
+  StructuralCat,
+
+  SymbolCat,
+  PredicationCat, --  - [predV3,predV2], --- gf bug
+
+  LexiconCat
+  ** {
+
+flags startcat = Phr ;
+
+} ;

lib/resource/mathematical/PredicationCat.gf

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+concrete PredicationCat of Predication = CatCat ** PredicationI with
+  (Syntax = SyntaxCat),
+  (Lang = LangCat) ;
+

lib/resource/mathematical/SymbolCat.gf

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+concrete SymbolCat of Symbol = CatCat ** SymbolRomance with
+  (ResRomance = ResCat) ;

lib/resource/mathematical/SymbolicCat.gf

@@ -0,0 +1,5 @@
+--# -path=.:present:mathematical:prelude
+
+resource SymbolicCat = Symbolic with 
+  (Symbol = SymbolCat),
+  (Grammar = GrammarCat) ;