Ideas from 'On Concept and Object' by Gottlob Frege [1892], by Theme Structure
[found in 'Translations from the Writings of Gottlob Frege' by Frege,Gottlob (ed/tr Geach,P/Black,M) [Blackwell 1980,0-631-12911-1]].
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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4975
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A thought can be split in many ways, so that different parts appear as subject or predicate
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6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers
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9949
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There is the concept, the object falling under it, and the extension (a set, which is also an object) [George/Velleman]
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7. Existence / A. Nature of Existence / 6. Criterion for Existence
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18995
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Frege mistakenly takes existence to be a property of concepts, instead of being about things [Yablo]
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8. Modes of Existence / B. Properties / 10. Properties as Predicates
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10317
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It is unclear whether Frege included qualities among his abstract objects [Hale]
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9. Objects / A. Existence of Objects / 3. Objects in Thought
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10535
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Frege's 'objects' are both the referents of proper names, and what predicates are true or false of [Dummett]
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18. Thought / D. Concepts / 3. Ontology of Concepts / c. Fregean concepts
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9839
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Frege equated the concepts under which an object falls with its properties [Dummett]
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18. Thought / D. Concepts / 5. Concepts and Language / b. Concepts are linguistic
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4973
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As I understand it, a concept is the meaning of a grammatical predicate
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19. Language / A. Nature of Meaning / 2. Meaning as Mental
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9167
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Frege felt that meanings must be public, so they are abstractions rather than mental entities [Putnam]
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19. Language / D. Propositions / 2. Abstract Propositions / a. Propositions as sense
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4974
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For all the multiplicity of languages, mankind has a common stock of thoughts
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