2Cf. Zhang Lifeng, "Comments on Plantinga's Argument of Tran- sworld Identity", forthcoming in Frontiers of Philosophy in China.
3A. Plantinga, The Nature of Necessity, Oxford University Press, 1974, p. 44,p. 46,p. 63.
4A. Plantinga, The Nature of Necessity, Ox-ford University Press, 1974, p. 77.
5Cf. G. E. Hughes and M. J. Cresswell, A New Introduction to Modal Logic, Routledge, 1996, p. 61.
6I. Kant, Critique of Pure Reason, translated by N. K. Smith, Lon- don, 1929, p. 505.
7W. V. Quine, The Ways of Paradox and Other Essays, Harvard University Press, 1976, p. 176.
8Cf. A. Plantinga, "On Existentialism", in Essays in the Metaphysics of Modality, Oxford University Press, 2003, pp. 158--175.
9A. Plantinga, God, Freedom, and Evil, Wm. B. Eerdmans Pub- lishing Co., 1977, p. 112.
10D. Chalmers, "Does Conceivability Entail Possibility?", in T. Gendler and J. Hawthorne (eds) Conceivability and Possibility, Oxford University Press, p. 147.
