This 1979 book shows how differential equation theory can be beautifully simplified by treating such equations from the product integral viewpoint.

This 1977 volume is concerned with the group-theoretic approach to special functions.

This 1985 text develops the theory of angular momentum from the viewpoint of a fundamental symmetry in nature.

The present volume of reprints are what I consider to be my most interesting and influential papers on algebra and topology. To tie them together, and to place them in context, I have supplemented them by a series of brief essays sketching their historieal background (as I see it). In addition to these I have listed some subsequent papers by others which have further developed some of my key ideas. The papers on universal algebra, lattice theory, and general topology collected in the present volume concern ideas which have become familiar to all working mathematicians. It may be helpful to...