Essays

From time to time the author has had an occasion or an impulse to write a short piece of an essentially expository nature. These essays mostly address issues that arise frequently in physics — for example those connected with understanding quantum mechanics. A number of these essays are collected here. The essays are are written at a level that should be accessible to many physicists, but they are not popular articles aimed at a general public. They do not replace the author’s longer efforts at exposition for example those in his Jerusalem Lectures (91) and Les Houches lectures (107). The essays were written over a period of some thirty years. They vary significantly in length, style, subject, quality, level, overlap, point of view, venue, and perhaps even in consistency between them.