Are Type-Identity and Multiple Realisability Compatible?

Remy Pereira - According to Putnam (1967), type-identity theory is incompatible with multiple realisability. In other words, if each type of mental state is identical with exactly one type of physical state, then that same mental state cannot be instantiated by different physical states in different contexts. In this essay I will argue, contra Putnam, that a restricted version of type- identity theory can be compatible with multiple realisability.