1. Basic Techniques.- 2. Statistical Methods.- 3. Dictionary Methods.- 4. Image Compression.- 5. Other Methods.- A. The ASCII Code.- B. Bibliography.- C. Curves That Fill Space.- D. Determinants and Matrices.- E. Error Correcting Codes.- F. Fourier Transform.- G. Group 4 Codes Summary.- H. Hashing.- I. Interpolating Polynomials.- Answers to Exercises.