Transverse waves on a string -- Waves on a membrane -- Introduction to the theory of elasticity -- One-dimensional elastic waves -- Acoustic waves in fluids -- Waves on a liquid surface -- Elastic waves in solids -- Electromagnetic waves -- Wave propagation in inhomogeneous and obstructed media -- Fraunhofer diffraction -- Fresnel diffraction -- Spectrum analysis of waveforms -- Appendix A : Vector calculus -- Appendix B : The Smith calculator -- Appendix C : Proof of the uncertainty relation.