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Opaque context

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An opaque context or referentially opaque context is a linguistic context in which it is not always possible to substitute "co-referential" expressions (expressions referring to the same object) without altering the truth of sentences. The expressions involved are usually grammatically singular terms. So, substitution of co-referential expressions into an opaque context does not always preserve truth. For example, "Lois believes x is a hero" is an opaque context because "Lois believes Superman is a hero" is true while "Lois believes Clark Kent is a hero" is false, even though 'Superman' and 'Clark Kent' are co-referential expressions.

Opaque context - Wikipedia Jump to content From Wikipedia, the free encyclopedia Context where substituting equivalent expressions can change truth or meaning For other uses, see Opacity (disambiguation) . An opaque context or referentially opaque context is a linguistic context in which it is not always possible to substitute "co-referential" expressions (expressions referring to the same object) without altering the truth of sentences. [ 1 ] The expressions involved are usually grammatically singular terms . So, substitution of co-referential expressions into an opaque context does not alway

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