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IsIn

check if one object is contained in another

Syntax 
X  IsIn  Y        (return BOOL)

Description
The semantics of IsIn is explained in the following table: 
   --------------------------------------------------------------------
  | OBJECT     IsIn  LIST    checks if the list contains the object.   |
  | POLY       IsIn  IDEAL   checks for ideal membership.              |
  | MODULEELEM IsIn  MODULE  checks for module membership.             |
  | STRING     IsIn  STRING  checks if the first string is a substring |
  |                      of the second one.                            |
   --------------------------------------------------------------------
                       IsIn operator