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Addresses whether something that exists necessarily in every possible world implies its existence in the actual world, influencing the debate on the relationship between modal truths and ontology.

Underscores arguments surrounding which properties are essential or necessary to an entity's identity, relying on modal logic's distinction between necessary and contingent properties.

Frames discussions about alternative ways the world might have been, providing a structured approach to talk about necessity and possibility in a metaphysical context.

Contrasts with modal realism and influences metaphysical debates on whether possible worlds are just useful fictions rather than real entities.

Impacts debates about whether individuals could have originated from different parents or sources, influencing the discussions on the metaphysics of identity and individual essence.

Informs discussions on the ontological status of possible worlds, raising questions about the existence and nature of non-actual possibles.

Illuminates debates on identity across possible worlds, shaping discussions on the essence and the necessary properties of entities.

Engages with the issue of how individuals or properties are inherited across different possible worlds, influencing discussions on essentialism and the nature of properties.

Explores how metaphysical statements could be necessarily true or possibly true, impacting discussions of essential properties and contingent facts.

Details how one possible world might access another, affecting conversations on the interrelationship between different modes of being and the nature of modal truths.

Underpins metaphysical debates with distinct sets of axioms and theorems (e.g., S4, S5), affecting theories of possible worlds and modal truths.

Crucial for exploring metaphysical distinctions between different kinds of truths—necessary, possible, and impossible truths—and their implications.

Applies in assessing whether every truth must have an explanation, including modal truths, thus affecting metaphysical discussions around causation and the nature of reality.

Contributes to the puzzle of whether individuals can exist across multiple possible worlds, influencing metaphysical theories of identity and persistence.

Plays a role in questioning how we come to know modal truths, which in turn affects metaphysical discussions on knowledge of essences and possibilities.

Affects metaphysical debates on identity and difference in modal reasoning, questioning how entities in different possible worlds relate to one another.

Incorporates counterfactual thinking into metaphysical debates, informing our understanding of causation, free will, and the nature of possibility.

Clarifies distinctions in discussions of properties or truths of objects (de re) versus propositions or statements (de dicto), affecting understanding of ontological commitments.

Shapes metaphysical debates by providing a way to distinguish actuality from mere possibility, affecting discussions on the uniqueness of the actual world.