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This collection brings together nine essays addressing the problem of compossibility in Leibniz's system of thought. The problem of compossibility is that of determining by what mechanism two independently possible substances are jointly possible (or not), and thus do (or do not) form part of the same possible world. The collection opens with an excellent introduction to the terrain, reviews established approaches to the problem, and will be extremely helpful to both those new to, and those familiar with, Leibniz.
Adam Harmer's essay provides a detailed analysis of the "world apart" doctrine, for which he considers three different interpretations: causal, ontological, and phenomenal, as well as weak and strong forms of each. Harmer concludes that Leibniz's world apart doctrine entails the weak versions of all three interpretations; yet this does not impact which of the three main approaches to compossibility (the logical, lawful, and cosmological) are correct. Mogens Lærke, in the process of arguing for the logical approach, interprets world apart (correctly in my opinion) as entailing only the causal independence of monads at the metaphysical level. It has no affect on their conceptual dependence on each other, nor on the...