ICTS

On the occasion of the inauguration of the International Centre for Theoretical Sciences, TIFR, I shall share some of my observations and conclusions as to the various roles of theory in science. Physics is the field of science where theory is most established and it is the most mature and powerful of the sciences. But theory, much of it derived from physics, is growing in importance in the neighboring fields of astronomy, chemistry and biology. Theory can both deepen our understanding of separate areas of science, as well as provide the intellectual glue of interdisciplinary research.