Brian Leftow offers a theist theory of necessity and possibility, and a new sort of argument for God's existence. He argues that necessities of logic and mathematics are determined by God's nature, but that it is events in God's mind - His imagination and choice - that account for necessary truths about concrete creatures.

The latter half of the 20 ...

This book provides an in-depth analysis of the nature and role of hypothetical reasoning about impossibilities. The interest in this subject stems from the simple observation that wondering is an inherent aspect of our experience. Whether one regrets choosing a taxicab over the subway or contemplates the outcome of an election turning out differently, the question 'What would have happened if...?' is a familiar one. While we often focus on possible scenarios, we also ponder impossible ones: What if whales were fish? What if a man could be in two places at once? What if one could draw a round square? Puzzles concerning such questions sparked a heated discussion over the nature and role of hypothetical reasoning about impossibilities. This book goes beyond being an opinionated introduction to this debate. After comparing various approaches to this issue, it proposes a novel perspective that draws on considerations from epistemology and the philosophy of explanation and dependence. Targeting researchers and students interested in the philosophy of modalities, this book delivers an in-depth analysis of a captivating and often overlooked aspect of human reasoning.

Some things are reasons for us to perform certain actions. That it will spare you great pain in the future, for example, is a reason for you to go to the dentist now, and that you are already late for work is a reason for you not to read the next article in the morning paper. Why are such considerations reasons for or against certain actions? Constructivism offers an intriguing answer to this question. Its basic idea is often encapsulated in the slogan that reasons are not discovered but made by us. Andreas Müller elaborates this idea into a fully-fledged account of practical reasons, makes its theoretical commitments explicit, and defends it against some well-known objections. Constructing Practical Reasons begins with an examination of the distinctive role that reason judgements play in the process of practical reasoning. This provides the resources for an anti-representationalist conception of the nature of those judgements, according to which they are true, if they are true, not because they accurately represent certain normative facts, but because of their role in sound reasoning. On the resulting view, a consideration owes its status as a reason to the truth of the corresponding reason judgement and thus, ultimately, to the soundness of a certain episode of reasoning. Consequently, our practical reasons exhibit a kind of mind-dependence, but this does not force us to deny their objectivity.

Noted philosopher Timothy Williamson uses ideas from contemporary psychology and data-driven science to identify defects in how many philosophers arrive at their theories, because they rely on common sense ways of thinking that are correct most but not all the time. When those ways of thinking are pushed too far, what Williamson refers to as overfitting can result in philosophical paradoxes. He shows how philosophers have over-complicated their theories in futile attempts to accommodate erroneous 'data' and he documents these problems in detail through case studies of contemporary philosophy. He also discusses what philosophers can do to avoid these problems. Williamson's important diagnosis and prescription will be of interest to a wide range of philosophers.

Modality - the question of what is possible and what is necessary - is a fundamental area of philosophy and philosophical research. The Routledge Handbook of Modality is an outstanding reference source to the key topics, problems and debates in this exciting subject and is the first collection of its kind. Comprising thirty-five chapters by a team of international contributors the Handbook is divided into seven clear parts: worlds and modality essentialism, ontological dependence, and modality modal anti-realism epistemology of modality modality in science modality in logic and mathematics modality in the history of philosophy. Within these sections the central issues, debates and problems are examined, including possible worlds, essentialism, counterfactuals, ontological dependence, modal fictionalism, deflationism, the integration challenge, conceivability, a priori knowledge, laws of nature, natural kinds, and logical necessity. The Routledge Handbook of Modality is essential reading for students and researchers in epistemology, metaphysics and philosophy of language. It will also be very useful for those in related fields in philosophy such as philosophy of mathematics, logic and philosophy of science.