|
5.1.75 lead
Syntax:
lead ( poly_expression )
lead ( vector_expression )
lead ( ideal_expression )
lead ( module_expression )
Type:
- the same as the input type
Purpose:
- returns the leading (or initial) term(s) of a polynomial, a vector,
resp. of the generators of an ideal or module with respect
to the monomial ordering.
Note:
IN may be used instead of lead .
Example:
| ring r=32003,(x,y,z),(c,ds);
poly f=2x2+3y+4z3;
vector v=[2x10,f];
ideal i=f,z;
module m=v,[0,0,2+x];
lead(f);
==> 3y
lead(v);
==> [2x10]
lead(i);
==> _[1]=3y
==> _[2]=z
lead(m);
==> _[1]=[2x10]
==> _[2]=[0,0,2]
lead(0);
==> 0
|
See
ideal;
leadcoef;
leadexp;
leadmonom;
module;
poly;
vector.
|