Originally published in Italian in 1976, this book describes the methods scientists use to investigate the physical world. It is ideal for students and teachers of science and the philosophy of science. It is both a high-level popularization and a critical appraisal of these methods, describing important advances in physics and analyzing the historical development, value, reliability and philosophical implications of the way physicists approach the problems confronting them. The introductory chapter on the meaning of physical theories and the mathematical (...) tools used to develop them is followed by a general discussion on the foundations of physics under four major headings: the physics of the reversible, the physics of the irreversible, microphysics, and cosmology. Throughout, the subject matter of physical theories is linked to discussion of the attendant philosophical and epistemological implications, such as the validity of the theories, inductive inference, causal explanation, probability, the role of observation and the reality of physical objects. (shrink)

The author, dismissing the feasibility of attaining the real facts of history, proposes to define historical truth as the set of all possible worlds that agree with all the sources available to the historian. He remarks that this conception is very close to that necessairly assumed today by cosmologists, when describing the evolution of the phisical universe.

These are the proceedings of the Workshop on Quantum Logic held in Erice (Sicily), December 2 - 9, 1979, at the Ettore Hajorana Centre for Scientific Culture. A conference of this sort was originally proposed by Giuliano Toraldo di Francia, who suggested the idea to Antonino Zichichi, and thus laid the foundation for the Workshop. To both of them we express our appreciation and thanks, also on behalf of the other participants, for having made this conference possible. (...) There were approximately fifty participants; their names and institutions are listed in the text. Quantum logic, which has now a history of some forty or more years, has seen remarkable growth during the sixties and seventies. The papers in the present volume presuppose, by and large, some acquaintance with the elements of the subject. These may be found in the well-known books by J.H. Jauch (Foundations of Quantum Hechanics; Reading, 1968), V.S. Varadarajan (Geometry of Quantum Theory: Princeton, 1968), and C. Piron (Foundations of Quantum Theory; New York, 1976). The initial program for the conference listed about twenty-five invited papers. But in the context of a very active and qualified attendance, other contributions were offered. This volume contains all of them. The program listed six main topics: I. Classification or different areas of quantum logic, and open problems. II. Comparison and unification of different approaches to quantum theories; problems of interpretation. III. Formal quantum logic; axiomatics. IV. Hodal interpretations of quantum logic. v vi FOREWORD V. Quantum set theory. (shrink)

This paper treats a classical topic of scientific epistemology from a new point of view. It considers biology to be a science intermediate between physics and sociology, and the transition from physics to biology as proceeding upwards. As a consequence, any type of reductionism will be avoided. The foundation of sociology can now be viewed as an extension of physics and biology. Indeed social reality is built by means of constitutive rules that create those social facts that have been denominated (...) ‘institutional'. Having argued for the connection among values and norms and actions, the problem is that of justifying this connection. Can values and norms be reasons that explain action? Can reasons be understood as causes? In this paper the thesis is advocated that reasons are not sufficient for causally explaining actions. Taking up the classical analysis of ‘practical inference', I want to point out that, if from the reasons for action logically followed the action itself, the reasons would be sufficient causes of the action: indeed, this would eliminate free will. For this reason, we must examine the problem of free will. My conclusion is in favor of the position of B. Libet, who has demonstrated free will experimentally, and therefore the nondeterministic nature of the practical-inferential model. (shrink)