Concept · Foundations

Rigid Designator

A term that picks out the same object in every possible world in which that object exists, as opposed to terms whose reference can shift across worlds.

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Why it matters

Rigidity is the key tool for analyzing necessary identity claims and essential properties in quantified modal logic.

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.

Units (1)

Modal Logic: Necessity, Possibility, and CounterfactualsStudents learn to reason about necessity, possibility, and counterfactual conditionals using the box and diamond operators, possible-worl…

Lessons (2)

Capstone: Modal Reasoning in Philosophy and ScienceModal Logic: Necessity, Possibility, and Counterfactuals Formalizing Modal ArgumentsModal Logic: Necessity, Possibility, and Counterfactuals

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