 
 
 
 
14.2 Classes
 A class with n parameters is any defined name with a type
(x1:A1)..(xn:An)s where s is a sort. Thus a class with
parameters is considered as a single class and not as a family of
classes. An object of a class C is any term of type (C t1
.. tn). In addition to these user-classes, we have two abstract
classes:
- 
SORTCLASS, the class of sorts; 
 its objects are the terms whose type is a sort.
- FUNCLASS, the class of functions; 
 its objects are all the terms with a functional 
 type, i.e. of form (x:A)B.
 
 
 
