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[Oct. 18th, 2010|04:59 pm] |
In general, we can determine that two apparently identical objects are indeed "the same one" only by modifying one object and then observing whether the other object has changed in the same way. But how can we tell if an object has "changed" other than by observing the "same" object twice and seeing whether some property of the object differs from one observation to the next? Thus, we cannot determine "change" without some a priori notion of "sameness", and we cannot determine sameness without observing the effects of change.
-- SICP |
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