l. Overview 2. The Language of Logic and Mathematics 3. Sense, Reference, Compositionality, and hierarchy 4. Frege’s Logic 5. Frege’s Philosophy of Mathematics 5.1. Critique of Naturalism, Formalism, and Psychologism 5.2. Critique of Kant 5.3. Frege’s Definition of Number 5.3.1. Numerical Statements Are about Concepts 5.3.2. But Numbers Are Objects 5.3.3. Objects and Identity 5.3.4. The Number ...