A Criterion for Extending Continuous-Mixture Identifiability Results

For continuous mixtures of random variables, we provide a simple criterion -- generating-function accessibility -- to extend previously known kernel-based identifiability (or unidentifiability) results to new kernel distributions. This criterion, based on functional relationships between the relevant kernels' moment-generating functions or Laplace transforms, may be applied to continuous mixtures of both discrete and continuous random variables. To illustrate the proposed approach, we present results for several specific kernels.