Reflections on Quanta, Symmetries, and Supersymmetries

This is a collection of essays based on lectures that author has given on various occasions on foundation of quantum theory, symmetries and representation theory, and the quantum theory of the superworld created by physicists.The lectures are linked by a unifying theme: how the quantum world and superworld appear under the lens of symmetry and supersymmetry.In the world of ultra-small times and di...