|  |  5.1.76 leadcoef 
See
 lead;
 leadexp;
 leadmonom;
 poly;
 vector.Syntax:leadcoef (poly_expression)
 leadcoef (vector_expression)Type:number
Purpose:returns the leading (or initial) coefficient of a polynomial or a vector
with respect to the monomial ordering.
Example:|  |   ring r=32003,(x,y,z),(c,ds);
  poly f=x2+y+z3;
  vector v=[2*x^10,f];
  leadcoef(f);
==> 1
  leadcoef(v);
==> 2
  leadcoef(0);
==> 0
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