 Of more immediate concern, at least for our purposes here, is what the Liar shows us about the basic principles governing truth, and about logic. In a skeptical vein, Tarski himself (1935, 1944) seems to have thought the Liar shows the ordinary notion of truth to be incoherent, and in need of replacement with a more scientifically respectable one. (For more on Tarski, see the entries on  Tarski  and  Tarski’s truth definitions.  For more on Tarski’s aims and purposes, see Heck 1997.) More common, and perhaps the dominant thread in the solutions to the Liar, is the idea that the basic principles governing truth are more subtle than the T-schema reflects.