Cord Friebe (University of Seigen)
The paper provides a coherent, unified view to save Leibniz's Principle of the Identity of Indiscernibles (PII) in the quantum domain. The discerning defense of PII can be applied to non-entangled, (anti)symmetric states, and the summing defense is successful in the case of entangled, (anti)symmetric states. However, the hard problem is with symmetric product states: a more subtle summing defense is needed. A novel understanding of Pauli exclusion (and its denial) arises, so that fermions and bosons are on a par with respect to PII but nonetheless ontologically discerned in a way to be specified.
