Cambridge changes revisited: Why certain relational changes are indispensable

Peter Geach and others suppose that change in an object's relational properties absent any change in its intrinsic properties is not a genuine change in that object but only a “mere Cambridge change.” I explain and reject two strategies challenging Geach's position. I then present my own argument against Geach which depends on the recognition of entities identified in terms of their emergent properties, i.e. properties not reducible to physical properties. I provide some examples of such entities and address the problem of finding a criterion for distinguishing genuine from nonge‐nuine change