Question 1

What is the core thesis of plurality of worlds in the book?

Accepted Answer

The book advances a thesis of plurality of worlds, also called modal realism, which holds that our world is only one world among many inclusive worlds.

Question 2

How does the book characterize the relationship between different worlds?

Accepted Answer

Different worlds are described as isolated, with no spatiotemporal relations between things in different worlds, no causal influence across worlds, and no overlap (except possibly repeated immanent universals).

Question 3

What positions does the book discuss and challenge regarding alternatives to modal realism?

Accepted Answer

It considers the “Ersatzist Programme” and its forms—linguistic, pictorial, and magical ersatzism—as a cheaper replacement strategy, and it later addresses debates about counterparts and double lives, including objections related to overlap and identity conditions.