Possible worlds are one of the foundational concepts in modal and intensional logics. Formulas in these logics are used to represent statements about what might be true, what should be true, what one believes … See more

The idea of possible worlds is most commonly attributed to Gottfried Leibniz, who spoke of possible worlds as ideas in the mind of God and used the notion to argue that our … See more

• D.M. Armstrong, A World of States of Affairs (1997. Cambridge: Cambridge University Press) ISBN 0-521-58948-7
• John … See more

Possible worlds are often regarded with suspicion, which is why their proponents have struggled to find arguments in their favor. An often-cited … See more

Metaphysics
The ontological status of possible worlds has provoked intense debate. David Lewis famously advocated for a position known as See more

• Standard translation, an embedding of modal logics into first-order logic which captures their possible world semantics
• N-universes
• Modal fictionalism
• Fictionalism See more

• "Possible Worlds" entry in the Stanford Encyclopedia of Philosophy
• "Possible worlds: what they are good for and what they are" — Alexander Pruss.
• "Possible Objects" entry in the Stanford Encyclopedia of Philosophy See more