JEM tutorial examples - some files missing still

examples/jem-math/MathEng.gf

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+concrete MathEng of Math = {
+
+lincat 
+  Prop, Exp = Str ;
+
+lin
+  And a b = a ++ "and" ++ b ;
+  Or a b = a ++ "or" ++ b ;
+  If a b = "if" ++ a ++ "then" ++ b ;
+
+  Zero = "zero" ;
+
+  X = "x" ;
+  Y = "y" ;
+
+  Successor x = "the successor of" ++ x ;
+
+  Sum x y = "the sum of" ++ x ++ "and" ++ y ;
+  Product x y = "the product of" ++ x ++ "and" ++ y ;
+
+  Even x = x ++ "is even" ;
+  Odd x = x ++ "is odd" ;
+  Prime x = x ++ "is prime" ;
+  
+  Equal x y = x ++ "is equal to" ++ y ;
+  Less x y = x ++ "is less than" ++ y ; 
+  Greater x y = x ++ "is greater than" ++ y ; 
+  Divisible x y = x ++ "is divisible by" ++ y ; 
+
+lincat 
+  Var = Str ;
+lin
+  X = "x" ;
+  Y = "y" ;
+
+  EVar x = x ;
+  EInt i = i.s ;
+
+  ANumberVar x = "a number" ++ x ;
+  TheNumberVar x = "the number" ++ x ;
+
+}