1992. Entailment: The Logic of Relevance and Necessity. Vol. 2. Princeton: Princeton University Press. References Further reading Mares, E. D. 1992. Andersonian deontic logic. Theoria 58: 3-20. 1925 births 1973 deaths 20th-century American philosophers University of Pittsburgh faculty American logicians Philosophers from Pennsylvania Philosophers from Connecticut Deaths from cancer in the United States