 Finally, there are a group of issues that fall under the heading of the dispensability of identity. According to one tradition that goes back, at least, to Wittgenstein's Tractatus, we can theoretically dispense with identity talk without loss of information. Some, but by no means all, who take this view, do so because they hold that the predicate ‘is identical with’ corresponds to no genuine property. Issues about the dispensability of identity engage with issues about identity across time in the following way. This section opened with a quote from David Lewis claiming that there is never any philosophical problem about identity. The case of Cup and Tcup raises what is ostensibly a problem about identity across time. That problem only arises, it seems, because the later Cup is putatively identical with the earlier Tcup. If the problem is not, in part, about that putative identity holding, what is it about?