class_docstr: This class contains the information about
  the A series of simple Lie algebras.
  ====
docstr: Returns the Lie algebra associated with A_n
docstr_tok: ["Returns","the","Lie","algebra","associated","with","A_n"]
code: def lie_algebra(self):
      """
      Returns the Lie algebra associated with A_n
      """
      n = self.n
      return "su(" + str(n + 1) + ")"
  
file_path: sympy/sympy/liealgebras/type_a.py
imports: from sympy.liealgebras.cartan_type import Standard_Cartan
  from sympy.core.backend import eye
label_desc: Use image node_id 10 for calling the TypeA obj's underlying member method code with example usage: obj.lie_algebra() and returns: unknown