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Full Idea
The 'conservation thesis' about substrates says that there is a single, most basic substrate that endures through every material change, something we call 'prime matter'.
Gist of Idea
A substrate may be 'prime matter', which endures through every change
Source
Robert Pasnau (Metaphysical Themes 1274-1671 [2011], 02.5)
Book Ref
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.29
Related Idea
Idea 16579 There may be different types of substrate, or temporary substrates [Pasnau]