class_docstr: A class for representing rational function fields. 
class_docstr_tok: ["A","class","for","representing","rational","function","fields","."]
docstr: Returns True if ``a`` is non-positive. 
docstr_tok: ["Returns","True","if","``","a","``","is","non-positive","."]
code: def is_nonpositive(self, a):
      """Returns True if ``a`` is non-positive."""
      return self.dom.is_nonpositive(a.numer().LC())
  
imports: from sympy.polys.domains.field import Field
  from sympy.polys.domains.compositedomain import CompositeDomain
  from sympy.polys.polyclasses import DMF
  from sympy.polys.polyerrors import GeneratorsNeeded
  from sympy.polys.polyutils import dict_from_basic, basic_from_dict, _dict_reorder
  from sympy.utilities import public
label_desc: Use image node_id 22 for calling the FractionField obj's underlying member method code with example usage: obj.is_nonpositive(a) and returns: self