This Element has two objectives: to discuss formulations of identity criteria and to take a closer look at one notorious criterion of object identity, Leibniz's Law. The author considers alternatives to Leibniz's Law as well as the possibility that there are no adequate identity criteria to be found...

This Element has two objectives: to discuss formulations of identity criteria and to take a closer look at one notorious criterion of object identity, Leibniz's Law. The author considers alternatives to Leibniz's Law as well as the possibility that there are no adequate identity criteria to be found.