class_docstr: Represents ordinal exponential and multiplication terms one of the
  building blocks of the :class:`Ordinal` class.
  In ``OmegaPower(a, b)``, ``a`` represents exponent and ``b`` represents multiplicity.
code: def exp(self):
      return self.args[0]
  
imports: from sympy.core import Basic, Integer
  import operator
label_desc: Use image node_id 2 for calling the OmegaPower obj's underlying member method code with example usage: obj.exp() and returns: self