Combining Texts

Ideas for 'works', '67: Platonic Questions' and 'The Ethics'

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2 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
If our ideas are adequate, what follows from them is also adequate [Spinoza]
     Full Idea: Whatever ideas follow in the mind from ideas which are adequate in the mind are also adequate.
     From: Baruch de Spinoza (The Ethics [1675], II Pr 40)
     A reaction: This appears to be Modus Ponens, and he calls it (in Sch 1) 'the foundations of our reasoning'. If 'adequate' ideas are knowledge, then this also seems to say that knowledge is closed under known implication.
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
For Aristotle, the subject-predicate structure of Greek reflected a substance-accident structure of reality [Aristotle, by O'Grady]
     Full Idea: Aristotle apparently believed that the subject-predicate structure of Greek reflected the substance-accident nature of reality.
     From: report of Aristotle (works [c.330 BCE]) by Paul O'Grady - Relativism Ch.4
     A reaction: We need not assume that Aristotle is wrong. It is a chicken-and-egg. There is something obvious about subject-predicate language, if one assumes that unified objects are part of nature, and not just conventional.