In philosophy and logic, the concept of a possible world is used to express modal claims. The concept of possible worlds is common in contemporary philosophical discourse and has also been disputed.
Read more about Possible World: Possibility, Necessity, and Contingency, Formal Semantics of Modal Logics, From Modal Logic To Philosophical Tool, Possible-world Theory in Literary Studies
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“I teach at Harvard that the world and the heavens, and the stars are all real, but not so damned real, you see.”
—Josiah Royce (1855–1916)