code: def convex_conj(self):
          
          return NuclearNorm(self.domain,
                             conj_exponent(self.__norm.outernorm.exponent),
                             conj_exponent(self.__norm.pwisenorm.exponent))
docs: Convex conjugate of the unit ball indicator of the nuclear norm.
  
          The convex conjugate is the dual nuclear norm where the dual norm is
          obtained by taking the conjugate exponent of both the outer and
          singular vector exponents.