Combining Texts

Ideas for 'Natural Kinds', 'Philosophia Epicurea' and 'The Ethics'

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2 ideas

9. Objects / F. Identity among Objects / 7. Indiscernible Objects

17175	There cannot be two substances with the same attributes [Spinoza]
	Full Idea: In nature there cannot be two or more substances of the same nature or attribute.
	From: Baruch de Spinoza (The Ethics [1675], I Pr 05)
	A reaction: This is the Identity of Indiscernibles.

9. Objects / F. Identity among Objects / 8. Leibniz's Law

17173	Two substances can't be the same if they have different attributes [Spinoza]
	Full Idea: Two substances having different attributes have nothing in common with one another.
	From: Baruch de Spinoza (The Ethics [1675], I Pr 02)
	A reaction: This is the contrapositive of Leibniz's Law (i.e of the Indiscernibility of Identicals). Same things must have same attributes, so if the attributes differ they can't be the same things.