Notes on Leibniz's principles

Predicate Containment Principle or  Predicate-in-Notion (CD Broad)

Now it is evident that all true predication has some basis in the nature of things and that, when a proposition is not an identity, that is, when the predicate is not explicitly contained in the subject, it must be contained in it virtually. [...] Thus the subject term must always contain the predicate term, so that one who understands perfectly the notion of the subject would also know that the predicate belongs to it (AW 228a).

D1: What is a predicate? It's what's asserted by words in the sentence about the subject. A semantical notion actually as Collingwood somewhere talks about.

D2: What's a proposition?: The truth contents of the sentence, i.e. subject + predicate.

D3: What's a substance? It boils down to being a mind-like entity, i.e. an Idealist stance. In otehr words, any substance of just a conceptual entity which as such, has predicates.

Q1: What's the principle/criteria by which, substances can be/are grouped? 
Possible Answer 1: CD Broad, 19 says that there's a contingent fact about the world of the clustering together of these properties. Leibniz states that it's actually divine decrees which relate some properties with others. p.20. 
Q1a: How is it assessed the validity of such criteria?


Pynn, G. () PCP Handout. NIU.
Pynn, G. () Leibniz on Substance Handout. NIU

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