Imperatives cannot be true or false, so they are shunned by logicians. And yet imperatives can be combined by logical connectives: "kiss me and hug me" is the conjunction of "kiss me" with "hug me". This example may suggest that declarative and imperative logic are isomorphic: just as the conjunction of two declaratives is true exactly if both conjuncts are true, the conjunction of two imperatives is satisfied exactly if both conjuncts are satisfied—what more is there to say? Much more, (...) I argue. "If you love me, kiss me", a conditional imperative, mixes a declarative antecedent ("you love me") with an imperative consequent ("kiss me"); it is satisfied if you love and kiss me, violated if you love but don't kiss me, and avoided if you don't love me. So we need a logic of three -valued imperatives which mixes declaratives with imperatives. I develop such a logic. (shrink)

Although Wilfrid Sellars's work holds a prominent place in recent analytic philosophy, little work has been done to situate his early approaches to normativity and the philosophy of language in their proper context. What little work has been done tends to emphasize Sellars's connection to a then dominant logical empiricism at the expense of marginalizing other American philosophical schools. On top of this historical issue, most scholars attempting to explain Sellars's systematic philosophy tend to ignore a developmental picture of Sellars's (...) positions and focus on explicating the systematic character of his thought. My dissertation attempts to correct both of these tendencies by offering a historically situated account of Sellars's early papers that presents his views in relation to logical empiricism, the "Iowa School" of philosophy as embodied in Gustav Bergmann's and Everett Hall's writings, and some aspects of traditional American philosophy. By fleshing out the context of Sellars's early papers, it becomes clear that the "strong" normativist project present in his later essays developed out of his shift from his attempt to fit "traditional" philosophical problems into a formalist approach to language. My thesis acts as a "correction" to the previous interpretive points by presenting a more complex characterization of the contextual influences on Sellars's early papers and creating a foundation for a developmental account of Sellars's later views. I do this by examining evidence from Sellars's unpublished correspondence and works from a myriad of archival sources in conjunction with an analysis of his early publications. (shrink)