Peacocke’s Epiphany: A Possible Problem for Semantic Approaches to Metaphysical Necessity

Peacocke’s Epiphany: A Possible Problem for Semantic Approaches to Metaphysical Necessity

The Metaphysical Necessity of Natural Laws

In this paper I will defend the thesis that natural laws are metaphysically necessary, i.e. obtain in every possible world. Metaphysical necessity and possibility are the unrestricted modalities in the semantical interpretation of the modal logic system S5, which I adopt in this paper. I shall defend the following definition of a law of nature: (D 1) L is a natural law if and only if (i) L obta...

Quantum Gravity as a Metaphysical Problem

Quantum gravity is usually represented as being one of the central open problems of modern fundamental physics. It is presented as being “a dream, a theoretical need and a scientific goal. It is a theory which still does not exist in complete form”, a “yet-to-be-found theory” [1]. The starting point of this paper is that such a non-existence claim is wrong: There exists a simple and straightfor...

‘Race’: Normative, Not Metaphysical or Semantic*

In recent years, there has been a flurry of work on the metaphysics of race. While it is now widely accepted that races do not share robust, biobehavioral essences, opinions differ over what, if anything, race is. Recent work has been divided between three apparently quite different answers. A variety of theorists argue for racial skepticism, the view that races do not exist at all. A second gr...

a new approach to credibility premium for zero-inflated poisson models for panel data

هدف اصلی از این تحقیق به دست آوردن و مقایسه حق بیمه باورمندی در مدل های شمارشی گزارش نشده برای داده های طولی می باشد. در این تحقیق حق بیمه های پبش گویی بر اساس توابع ضرر مربع خطا و نمایی محاسبه شده و با هم مقایسه می شود. تمایل به گرفتن پاداش و جایزه یکی از دلایل مهم برای گزارش ندادن تصادفات می باشد و افراد برای استفاده از تخفیف اغلب از گزارش تصادفات با هزینه پائین خودداری می کنند، در این تحقیق ...