[學術討論會] Modal Logic without Accessibility Relations (6/6)

臺 大 哲 學 系

學 術 討 論 會 公 告

主講人：Prof. Shay Logan

Assistant Professor, Department of Philosophy, Kansas State University

主  題：Modal Logic without Accessibility Relations

時  間：114年6月6日（週五）

      下午15:00 – 17:00

地  點：臺灣大學水源校區哲學系館三樓 302室（台北市思源街18號）

歡迎參加討論，謝謝！

Seminar

Speaker: Prof. Shay Logan

Assistant Professor, Department of Philosophy, Kansas State University

Title: Modal logic without accessibility relations

Date: 15:00 – 17:00 pm, Friday, June 6, 2025

Venue: Conference Room 302, Department of Philosophy, ShuiYuan Campus, National Taiwan University (18, SiYuan Street, Taipei)

Abstract:

How do we think about what's possible? In this talk I will discuss two competing

answers to this question.

The World-Based Story: Focuses on Kripke semantics, where we think

about different "worlds" and what could be true in each one. From this view,

possibilities are simply what can happen at any world in our model.

The Logic-Based Story: Focuses on the logic itself. From this view,

possibilities are the sets of statements that, according to the logic, can all be true

together.

These might sound like two ways of saying the same thing, but they're not. This

talk will show you how these approaches differ and why this difference matters for

how we understand possibility itself.

I'll walk through both stories step by step, demonstrate where they give different

answers, and explain what this means for modal logic. Along the way, we'll also

build a new type of semantics for modal logic K - one that doesn't rely on

accessibility relations between worlds.