This is philosophically unsatisfying to some and has motivated additional work in set theory and other methods of formalizing the foundations of mathematics such as New Foundations by Willard Van Orman Quine.
Derrida has been involved in a number of high profile disagreements with prominent philosophers including Michel Foucault, John Searle, Willard Van Orman Quine, Peter Kreeft, and Jürgen Habermas.
:"How can we talk about Pegasus? To what does the word 'Pegasus' refer? If our answer is, 'Something,' then we seem to believe in mystical entities; if our answer is, 'nothing', then we seem to talk about nothing and what sense can be made of this? Certainly when we said that Pegasus was a mythological winged horse we make sense, and moreover we speak the truth! If we speak the truth, this must be truth about something. So we cannot be speaking of nothing."
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After earning his bachelor and masters degrees at the University of Oslo, he attended Harvard University and earned his Ph.D. in 1961 under Willard Van Orman Quine.
The book touches on the rise of model theory as well as proof theory, and on the emergence of American research on the foundation of mathematics, especially in the hands of E. H. Moore and his students, of the postulate theorists, and of Quine.
Hintikka's work can be seen as a continuation of the analytic tendency in philosophy founded by Franz Brentano and Peirce, advanced by Gottlob Frege and Bertrand Russell, and continued by Rudolf Carnap, Willard Van Orman Quine, and by Hintikka's teacher Georg Henrik von Wright.
His emphasis on formal rigor in specifying the type of knowledge that was eventually to be called "ontologies" by computer scientists, led him to the field of formal ontology in philosophy, where he began to study the metaphysics literature, focusing on the work of such notables as Quine, Strawson, and especially Simons.
Other related terms in philosophy and in cognitive science include "ontological relativity" (as in Quine) and "cognitive relativism" (as in Jack Meiland).