In addition, in his essay "The Resistance to Theory", which explores the task and philosophical bases of literary theory, de Man uses the example of the classical "trivium" of grammar, rhetoric, and logic to argue that the use of linguistic sciences in literary theory and criticism (i.e. a structuralist approach) was able to harmonize the logical and grammatical dimension of literature, but only at the expense of effacing the rhetorical elements of texts which presented the greatest interpretive demands. He posits that the resistance to theory is the resistance to reading, thus the resistance to theory is theory itself. Or the resistance to theory is what constitutes the possibility and existence of theory. Taking up the example of the title of Keats's poem "The Fall of Hyperion", de Man draws out an irreducible interpretive undecidability which bears strong affinities to the same term in Derrida's work and some similarity to the notion of incommensurability as developed by Jean-François Lyotard in "The Postmodern Condition" and "The Differend". De Man argues that the recurring motive of theoretical readings is to subsume these decisions under theoretical, futile generalizations, which are displaced in turn by harsh polemics about theory.