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IsIn
Syntax
E IsIn F

where E and F are CoCoA objects.  For a precise description of
allowable objects, see the full online help entry.
Summary
check if one object is contained in another
Description
The semantics of IsIn is explained in the following table:

    ----------------------------------------------------------------
   | POLY   IsIn  IDEAL   checks for ideal membership.              |
   | VECTOR IsIn  MODULE  checks for module membership.             |
   | OBJECT IsIn  LIST    checks if the list contains the object.   |
   | STRING IsIn  STRING  checks if the first string is a substring |
   |                      of the second one.                        |
    ----------------------------------------------------------------
                       IsIn operator