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9. Objects / A. Existence of Objects / 2. Abstract Objects / b. Need for abstracta

[why we might postulate non-physical objects]

5 ideas
Our conceptual scheme becomes more powerful when we posit abstract objects [Quine]
We need a logical use of 'object' as predicate-worthy, and an 'ontological' use [Strawson,P]
Physics is full of non-physical entities, such as space-vectors [Putnam]
If we can intuitively apprehend abstract objects, this makes them observable and causally active [Dummett]
Abstract objects were a bad way of explaining the structure in mathematics [Kitcher]