 However, according to the 2D rationalist, epistemic intensions play the core semantic roles associated with Fregean senses (Chalmers 2002b). Like Fregean senses, epistemic 1-intensions lend themselves to a compositional semantic theory: the epistemic intension of a sentence is determined by the epistemic intensions of the component expressions. Moreover, epistemic 1-intensions, like Fregean senses, reflect the speaker’s own rational perspective on what her words represent. Two token names ‘A’ and ‘B’ have the same Fregean senses iff the identity ‘A = B’ would strike the speaker as trivially true. Similarly, a subject associates two token expressions with the same epistemic intension iff they are apriori  equivalent.[21]  Finally, epistemic intensions may play a role similar to that of Fregean senses in the semantics of attitude reports (Chalmers 2011a). Overall, then, epistemic intensions seem to provide an attractive theoretical refinement of the Fregean notion of sense.