Basic Mathematics ================= This is my series on Basic Mathematics by Serge Lang. You can support my work by buying this book through this Amazon affiliate link: .. raw:: html YouTube Playlist: https://www.youtube.com/playlist?list=PLMcpDl1Pr-viA25VUkHNmcUkWx9usPgyb .. raw:: html .. toctree:: :maxdepth: 2 :caption: Contents: Introduction 1.1 The Integers 1.2 Rules for Addition 1.3 Rules for Multiplication 1.4 Even and Odd Integers; Divisibility 1.5 Rational Numbers 1.6 Multiplicative Inverses 2.1 Equations in Two Unknowns 2.2 Equations in Three Unknowns 3.1 Addition and Multiplication 3.2 Real Numbers Positivity 3.3 Powers and Roots 3.4 Inequalities 4 Quadratic Equations I.1 On Reading Books I.2 Logic I.3 Sets and Elements I.4 Notation 5.1 Distance 5.2 Angles 5.3 The Pythagoras Theorem 6.1 Some Standard Mappings of the Plane 6.2 Isometries 6.3 Composition of Isometries 6.4 Inverse of Isometries 6.5 Characterization of Isometries 6.6 Congruences 7.1 Area of a Disc of Radius r 7.2 Circumference of a Circle of Radius r 8.1 Coordinate Systems 8.2 Distance Between Points 8.3 Equation of a Circle 8.4 Rational Points on a Circle 9.1 Dilation and Reflections 9.2 Addition, Subtraction, and the Parallelogram Law 10.1 Segments 10.2 Rays 10.3 Lines 10.4 Ordinary Equation for a Line 11.1 Radian Measure 11.2 Sine and Cosine 11.3 The Graphs 11.4 The Tangent 11.5 Addition Formula 11.6 Rotations 12.1 The Straight Line Again 12.2 The Parabola 12.3 The Ellipse 12.4 The Hyperbola 12.5 Rotation of Hyperbolas 13.1 Definition of a Function 13.2 Polynomial Functions 13.3 Graphs of Functions 13.4 Expnential Functions 13.5 Logarithms 14.1 Definition 14.2 Formalism of Mappings 14.3 Permutations 15.1 The Complex Plane 15.2 Polar Form 16.1 Induction 16.2 Summations 16.3 Geometric Series 17.1 Matrices 17.2 Determinants of Order 2 17.3 Properties of 2x2 Determinants 17.4 Determinants of Order 3 17.5 Properties of 3x3 Determinants 17.6 Cramer's Rule Review