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27. Natural Reality / A. Physics / 1. Matter / g. Matter as extension

[matter is just the occupation of space]

4 ideas
Bodies are three-dimensional substances [Aquinas]
Impenetrability only belongs to the essence of extension [Descartes]
Matter is not hard, heavy or coloured, but merely extended in space [Descartes]
Leibniz eventually said resistance, rather than extension, was the essence of body [Leibniz ,by Pasnau]