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Gaifman's recent work include logical systems that formalize aspects of natural reasoning (pointer logic for solving the semantic paradoxes, contextual logic for handling vagueness and the Sorites paradox), phenomena of self-reference, metaphysical realism, philosophy of logic, philosophy of mathematics, Frege, Russell, and the early Wittgenstein.
Matthew W. McKeon is the chair of the philosophy department at Michigan State University and well known philosopher of logic.
Peter Simons (1982) "On understanding Lesniewski," History and Philosophy of Logic.