Abstract

This chapter discusses indeterminacy. Indeterminacy in the world is a genuine option within idealism, realism, or pragmatism. It pertains to states of affairs, such as whether a certain object has or lacks a certain property. If neither of these is the case, then the state of affairs is indeterminate, and a sentence reporting it lacks truth-value. A semantics is described for a logical notation in which sentences may lack truth-value. It contains a connective ‘!’ for determinate truth. The logic of such a language is described, in which validity means guaranteed preservation of truth.