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'Philosophy of Mathematics', 'My Philosophical Development' and 'New System and Explanation of New System'
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3 ideas
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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Leibniz bases everything on subject/predicate and substance/property propositions [Russell]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / e. Empty names
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Names are meaningless unless there is an object which they designate [Russell]
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5. Theory of Logic / J. Model Theory in Logic / 2. Isomorphisms
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A theory is 'categorical' if it has just one model up to isomorphism [Horsten]
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