Edwards's Gangle thought experiment is intended to show that existence can't be a defining property.

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Edwards's Gangle thought experiment is not a recognized philosophical thought experiment. The confusion might stem from a misinterpretation or misspelling. A relevant and well-known argument related to existence not being a defining property is Anselm's ontological argument, which was critiqued by Immanuel Kant by arguing that existence is not a predicate or defining characteristic.

Edwards's Gangle Thought Experiment Is Intended to Show That Existence