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The relationship between identity and change in the philosophical field of metaphysics seems, at first glance, deceptively simple, and belies the complexity of the issues involved. This article explores "the problem of identity and change". == Change == When an object changes, it always changes ''in some particular way''. A baby grows up, and so changes in respect of size and maturity; a snake sheds its skin, and so changes in respect of its skin. "Change" may therefore be defined as follows: : An object, ''O'', changes with respect to property, ''P'', if and only if ''O'' has ''P'' at one time, and at a later time, ''O'' does not have ''P''. That seems to be, in one way, what it means for a thing to change: it has a property at one time, and later it does not have that property. If a banana becomes brown, it can then be said: at one time, the banana is yellow; several days later, the banana is not yellow, but is instead brown. This appears fairly straightforward at this point, and there are no apparent problems as yet. Another way for an object to change is to change its parts. : An object, ''O'', changes with respect to its part, ''P'', if and only if ''O'' has the part ''P'' at one time, and at a later time, ''O'' does not have ''P''. Some philosophers believe that an object can't persist through a change of parts. They defend mereological essentialism. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Identity and change」の詳細全文を読む スポンサード リンク
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