Preface 
Chapter 1. 
Introduction 
Chapter 2. 
Background Preliminaries 


1. Piecewise continuity, piecewise differentiability 2. Partial and total differentiation 3. Differentiation of an integral 4. Integration by parts 5. Euler's theorem on homogeneous functions 


6. Method of undetermined lagrange multipliers 7. The line integral 8. Determinants 9. Formula for surface area 10. Taylor's theorem for functions of several variables 


11. The surface integral 12. Gradient, laplacian 13. Green's theorem (two dimensions) 14. Green's theorem (three dimensions) 
Chapter 3. 
Introductory Problems 


1. A basic lemma 2. Statement and formulation of several problems 3. The EulerLagrange equation 4. First integrals of the EulerLagrange equation. A degenerate case 5. Geodesics 


6. The brachistochrone 7. Minimum surface of revolution 8. Several dependent variables 9. Parametric representation 


10. Undetermined end points 11. Brachistochrone from a given curve to a fixed point 
Chapter 4. 
Isoperimetric Problems 


1. The simple isoperimetric problem 2. Direct extensions 3. Problem of the maximum enclosed area 4. Shape of a hanging rope. 5. Restrictions imposed through finite or differential equations 
Chapter 5. 
Geometrical Optics: Fermat's Principle 


1. Law of refraction (Snell's law) 2. Fermat's principle and the calculus of variations 
Chapter 6. 
Dynamics of Particles 


1. Potential and kinetic energies. 2. Generalized coordinates 3. Hamilton's principle. Lagrange equations of motion 3. Generalized momenta. Hamilton equations of motion. 


4. Canonical transformations 5. The HamiltonJacobi differential equation 6. Principle of least action 7. The extended Hamilton's principle 
Chapter 7. 
Two Independent Variables: The Vibrating String 


1. Extremization of a double integral 2. The vibrating string 3. Eigenvalueeigenfunction problem for the vibrating string 


4. Eigenfunction expansion of arbitrary functions. Minimum characterization of the eigenvalueeigenfunction problem 5. General solution of the vibratingstring equation 


6. Approximation of the vibratingstring eigenvalues and eigenfunctions (Ritz method) 7. Remarks on the distinction between imposed and free endpoint conditions 
Chapter 8. 
The SturmLiouville EigenvalueEigenfunction Problem 


1. Isoperimetric problem leading to a SturmLiouville system 2. Transformation of a SturmLiouville system 3. Two singular cases: Laguerre polynomials, Bessel functions 
Chapter 9. 
Several Independent Variables: The Vibrating Membrane 


1. Extremization of a multiple integral 2. Change of independent variables. Transformation of the laplacian 3. The vibrating membrane 4. Eigenvalueeigenfunction problem for the membrane 


5. Membrane with boundary held elastically. The free membrane 6. Orthogonality of the eigenfunctions. Expansion of arbitrary functions 7. General solution of the membrane equation 


8. The rectangular membrane of uniform density 9. The minimum characterization of the membrane eigenvalues 10. Consequences of the minimum characterization of the membrane eigenvalues 


11. The maximumminimum characterization of the membrane eigenvalues 12. The asymptotic distribution of the membrane eigenvalues 13. Approximation of the membrane eigenvalues 
Chapter 10. 
Theory of Elasticity 


1. Stress and strain 2. General equations of motion and equilibrium 3. General aspects of the approach to certain dynamical problems 4. Bending of a cylindrical bar by couples 


5. Transverse vibrations of a bar 6. The eigenvalueeigenfunction problem for the vibrating bar 7. Bending of a rectangular plate by couples 8. Transverse vibrations of a thin plate 


9. The eigenvalueeigenfunction problem for the vibrating plate 10. The rectangular plate. Ritz method of approximation 
Chapter 11. 
Quantum Mechanics 


1. First derivation of the Schrödinger equation for a single particle 2. The wave character of a particle. Second derivation of the Schrödinger equation 


3. The hydrogen atom. Physical interpretation of the Schrödinger wave functions 4. Extension to systems of particles. Minimum character of the energy eigenvalues 


5. Ritz method: Ground state of the helium atom. Hartree model of the manyelectron atom 
Chapter 12. 
Electrostatics 


1. Laplace's equation. Capacity of a condenser 2. Approximation of the capacity from below (relaxed boundary conditions) 3. Remarks on problems in two dimensions 


4. The existence of minima of the Dirichlet integral 

Bibliography; Index 