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Nominalism/Hacking: does not affect the existence, but classifying. It is not only due to our way of thinking that we distinguish between grass and straw. The boundaries are not given by nature, the categories are given by the mind, not by nature. Rorty: we cannot divide nature at the joints.- Does not deny the existence of material objects.
> Idealism: concerns the existence!
Nominalism, Traditional/Hacking: believes that categories are a product of the human mind, but not changeable. KuhnVs: even very changeable.
Nominalism/HackingVsPutnam: concerns the classification, not the objects - Idealism: concerns the objects.
Einführung in die Philosophie der Naturwissenschaften Stuttgart 1996