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'fragments/reports', 'Grundlagen der Arithmetik (Foundations)' and 'De ente praedicamentali'
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8 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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Convert "Jupiter has four moons" into "the number of Jupiter's moons is four" [Frege]
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5. Theory of Logic / E. Structures of Logic / 8. Theories in Logic
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Despite Gödel, Frege's epistemic ordering of all the truths is still plausible [Frege, by Burge]
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The primitive simples of arithmetic are the essence, determining the subject, and its boundaries [Frege, by Jeshion]
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5. Theory of Logic / G. Quantification / 6. Plural Quantification
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Each horse doesn't fall under the concept 'horse that draws the carriage', because all four are needed [Oliver/Smiley on Frege]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
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We can show that a concept is consistent by producing something which falls under it [Frege]
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5. Theory of Logic / K. Features of Logics / 1. Axiomatisation
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To understand axioms you must grasp their logical power and priority [Frege, by Burge]
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