Concept · Foundations
Possibility
A proposition is possible at a world when it is true in at least one possible world accessible from that world; written as the diamond operator in front of the proposition. With unrestricted accessibility this is simply truth in some possible world.
Why it matters
Possibility is the dual of necessity and is essential for talking about what could have been and what might still be.
Where this shows up
Units and lessons using this concept
Following the links will take you to the page where this term is introduced in context.
Lessons (4)
Capstone: Modal Reasoning in Philosophy and ScienceModal Logic: Necessity, Possibility, and CounterfactualsFormalizing Modal ArgumentsModal Logic: Necessity, Possibility, and CounterfactualsThe Modal Operators and Their RulesModal Logic: Necessity, Possibility, and CounterfactualsWhat Is Modal Logic?Modal Logic: Necessity, Possibility, and Counterfactuals
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