As indicated, Kripke denies that his argument (for the necessity of origin) applies to the case of change over time: “The question whether the table could have changed into ice is irrelevant here” (1972, 1980). So the question whether \(O\) could change into \(S\) is supposedly “irrelevant.” But Kripke does not give a reason for this claim, and if cases of trans-temporal identity and trans-world identity differ markedly in relevant respects — respects relevant to Kripke’s argument for the necess