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4.9.1 list declarations

Syntax:
list name = expression_list;
list name = list_expression;

Purpose:
defines a list (of objects of possibly different types).

Default:
empty list

Example:
 
  list l=1,"str";
  l[1];
==> 1
  l[2];
==> str
  ring r;
  listvar(r);
==> // r                              [0]  *ring
  ideal i = x^2, y^2 + z^3;
  l[3] = i;
  l;
==> [1]:
==>    1
==> [2]:
==>    str
==> [3]:
==>    _[1]=x2
==>    _[2]=z3+y2
  listvar(r);     // the list l belongs now to the ring r
==> // r                              [0]  *ring
==> // l                              [0]  list, size: 3
==> // i                              [0]  ideal, 2 generator(s)