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xviii<strong>Applied</strong> <strong>Diff</strong>erential <strong>Geom</strong>etry: A Modern Introduction1.1.7 Lie Groups . . . . . . . . . . . . . . . . . . . . . . 281.1.7.1 Application: Physical Examples ofLie Groups . . . . . . . . . . . . . . . . 301.1.8 Application: A Bird View on Modern Physics . 311.1.8.1 Three Pillars of 20th Century Physics . 311.1.8.2 String Theory in ‘Plain English’ . . . . 331.2 Application: Paradigm of <strong>Diff</strong>erential–<strong>Geom</strong>etricModelling of Dynamical Systems . . . . . . . . . . . . . . 462. Technical Preliminaries: Tensors, Actions and Functors 512.1 Tensors: Local Machinery of <strong>Diff</strong>erential <strong>Geom</strong>etry . . . . 512.1.1 Transformation of Coordinates and ElementaryTensors . . . . . . . . . . . . . . . . . . . . . . . . 512.1.1.1 Transformation of Coordinates . . . . . 522.1.1.2 Scalar Invariants . . . . . . . . . . . . . 532.1.1.3 Vectors and Covectors . . . . . . . . . . 532.1.1.4 Second–Order Tensors . . . . . . . . . . 542.1.1.5 Higher–Order Tensors . . . . . . . . . . 562.1.1.6 Tensor Symmetry . . . . . . . . . . . . 572.1.2 Euclidean Tensors . . . . . . . . . . . . . . . . . . 582.1.2.1 Basis Vectors and the Metric Tensorin R n . . . . . . . . . . . . . . . . . . . 582.1.2.2 Tensor Products in R n . . . . . . . . . . 592.1.3 Covariant <strong>Diff</strong>erentiation . . . . . . . . . . . . . . 602.1.3.1 Christoffel’s Symbols . . . . . . . . . . . 602.1.3.2 Geodesics . . . . . . . . . . . . . . . . . 612.1.3.3 Covariant Derivative . . . . . . . . . . . 612.1.3.4 Covariant Form of <strong>Diff</strong>erentialOperators . . . . . . . . . . . . . . . . . 622.1.3.5 Absolute Derivative . . . . . . . . . . . 632.1.3.6 3D Curve <strong>Geom</strong>etry: Frenet–SerretFormulae . . . . . . . . . . . . . . . . . 642.1.3.7 Mechanical Acceleration and Force . . . 642.1.4 Application: Covariant Mechanics . . . . . . . . 652.1.4.1 Riemannian Curvature Tensor . . . . . 702.1.4.2 Exterior <strong>Diff</strong>erential Forms . . . . . . . 712.1.4.3 The Covariant Force Law . . . . . . . . 762.1.5 Application: Nonlinear Fluid Dynamics . . . . 782.1.5.1 Continuity Equation . . . . . . . . . . . 78

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