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'On Body and Force, Against the Cartesians', 'Logic in Mathematics' and 'On Nature Itself (De Ipsa Natura)'
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2 ideas
9. Objects / B. Unity of Objects / 2. Substance / d. Substance defined
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Substance is a force for acting and being acted upon [Leibniz]
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9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
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Every concept must have a sharp boundary; we cannot allow an indeterminate third case [Frege]
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