Electronic Journal of Differential Equations, Conference 04 (2000), pp. 231-242. Title: Quantum electrodynamics and the fundamental constants Authors: Peter J. Mohr (National Inst. of Standards and Technology, Gaithersburg, MD USA) & Barry N. Taylor (National Inst. of Standards and Technology, Gaithersburg, MD USA) Abstract: The fundamental constants are evaluated by comparison of the results of critical experiments and the theoretical expressions for these results written in terms of the constants. Many of the theoretical expressions are based on quantum electrodynamics (QED), so the consistency of the comparison provides a critical test of the validity of the theory. Published July 12, 2000. Math Subject Classifications: 81V10. Key Words: Fundamental physical constants; quantum electrodynamics.