If the identity theory were correct, the predicate 'is true' and 'obtains' would be co-extensive across all linguistic frames, but their divergent grammatical behavior in embedded contexts falsifies this expectation.

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Embedded contexts(where 'is true' and 'obtains' behave differently from each other): Situations where a phrase or clause is placed inside another phrase or sentence, rather than standing alone (for example, 'I think that snow is white' embeds 'snow is white' inside a larger sentence).
Identity theory(Contrasted with dualism in philosophy of mind): The philosophical position that mental states are identical to brain states (mind-brain identity theory)
Linguistic frames(the different grammatical contexts being discussed): Different ways of arranging or structuring language, including how sentences are built and organized.
co-extensive(The relation bridge laws establish between social and individualist descriptions): Having the same reference; two descriptions are co-extensive when they pick out the same entities or phenomena

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