Material persistants are particular universals whose instances are material structures; they are related to those entities which are called sometimes continuants or objects, as apples, cars or houses. Material persistants capture the phenomenon of persistance through time of a material object. A material persistant P satisfies a number of neccessary conditions. For every material persistant P there exists a process P such that the set of instances of P coincides with the set of process-boundaries of P. This implies the existence of a chronoid c such that for every time-point t of c there exists exactly one instance of P at time point t.
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