Non-individuality and the denial of self-identity in Quantum Mechanics

 Non-individuality can be understood in terms of the denial of self-identity. 

This suggestion can be found most prominently in the philosophical reflections of Born, Schrödinger, Hesse and Post (Born 1943; Schrödinger 1952; Hesse 1963; Post 1963). 

It is immediately and clearly problematic, however: how can we have objects that are not identical to themselves? 

Such self-identity seems bound up with the very notion of objecthood in the sense that it is an essential part of what it is to be that object . This intuition is summed up in the Quinean slogan, ‘no entity without identity’ (Quine 1969), with all its attendant consequences regarding reference etc.