This book offers a major reassessment of Abelard’s modal logic and theory of modalities, and provides a comprehensive study of the 12th-century context in which his views originated and developed, by analysing many logical sources that are still unedited and mostly unexplored.

Kurt Mosser argues that reading Kant's Critique of Pure Reason as an argument for such a logic of experience makes more defensible many of Kant's most controversial claims, and makes more accessible Kant's notoriously difficult text.

This is a reissue of a book which is an exploration and defence of the notion of modality 'de re', the idea that objects have both essential and accidental properties. It is one of the first full-length studies of the modalities to emerge from the debate to which Saul Kripke, David Lewis, Ruth Marcus and others have contributed. The argument is developed by means of the notion of possible worlds, and ranges over key problems including the nature of essence, trans-world identity, negative existential propositions, and the existence of unactual objects in other possible worlds. In the final chapters Professor Plantinga applies his logical theories to the clarification of two problems in the philosophy of religion - the Problem of Evil and the Ontological Argument.

Possibility and Necessity was first published in 1987. Minnesota Archive Editions uses digital technology to make long-unavailable books once again accessible, and are published unaltered from the original University of Minnesota Press editions. This two-volume work—Jean Piaget's last—was published in France in 1981 and 1983 and is available now for the first time in English translation. Reflecting the preoccupations and methodologies of his later years, Possibility and Necessity combines theoretical interpretation with detailed summaries of the experiments Piaget and his colleagues used to test their hypotheses. Volume 2 presents a series of experiments documenting the way children between the ages of four or five and eleven to thirteen come to develop a grasp of necessity and its role in understanding the world about them. The experiments show how children proceed from an initial level (at four or five years) of pseudo-necessities, where they see the world as necessarily what it appears to be without the existence of other possibilities, to an intermediate level (at six to ten years), where pseudo-necessities give way to increasingly rich arrays of possibilities, and a final stage (at eleven to thirteen years), where children are able to select among these multiple possibilities the one that fits all the data. This stage represents the optimal level of understanding reality, which is now seen by the child as infinitely variable yet coherent and lawful. Psychologically, this lawfulness corresponds to a sense of necessity, or certainty. Volume 2 thus completes the theory presented in Volume 1 (The Role of Possibility in Cognitive Development) by showing how cognitive development is mediated on the one hand by a dialectical process of ever-expanding possibilities and, on the other, by increasingly delimiting necessities. In demonstrating how this process operates in psychological development—and in pointing out analogies in the history of science — Piaget gave his genetic epistemology its final and most accomplished form. The acquisition of knowledge is thus shown to be the result of two complementary processes: the formation of possibilities and the grasping of necessary laws and constraints in the construction of a reasoned representation of the external world.

First published in 1999. Routledge is an imprint of Taylor & Francis, an informa company.

This book is one of the many Islamic publications distributed by Mustafa Organization throughout the world in different languages with the aim of conveying the message of Islam to the people of the world. Mustafa Organization is a registered Organization that operates and is sustained through collaborative efforts of volunteers in many countries around the world, and it welcomes your involvement and support. Its objectives are numerous, yet its main goal is to spread the truth about the Islamic faith in general and the Shi`a School of Thought in particular due to the latter being misrepresented, misunderstood and its tenets often assaulted by many ignorant folks, Muslims and non-Muslims. Organization's purpose is to facilitate the dissemination of knowledge through a global medium, the Internet, to locations where such resources are not commonly or easily accessible or are resented, resisted and fought!

Introduces readers to the history of necessity and possibility, two modal concepts which play a key role in philosophy.