Abstract
DeRose famously argued that, given that assertability varies with practical context, we cannot combine a biconditional knowledge norm of assertion with classical invariantism. The first aim of this paper is to show that De Rose's argument is ultimately unsuccessful. Second, I develop a view, entitled Assertion Functionalism, which combines the knowledge norm with classical invariantism and at the same time offers an appealing account of the intuitive variability of proper assertion.
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