ABSTRACT
This chapter defends the principle that inferential knowledge of a conclusion requires known relevant premises. It begins by explaining this principle, illustrating it with a case that involves what we may call a harmless falsehood. It then argues that proponents of so-called knowledge from falsehood (KFF) face a dilemma. First, if alleged cases of KFF are supplemented with plausible assumptions, then the subject's knowledge is based not on false belief but on tacit knowledge. The falsehood is thus harmless. Second, if these plausible assumptions are withheld, then the subject lacks knowledge of the truth inferred from the falsehood. The alleged case of KFF is actually a Gettier case.
