users.cs.duke.edureif/paper/benor/realclosed.pdfIBM Research, Yorktown Heights, New York AND JOHN...
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users.cs.duke.edureif/paper/benor/realclosed.pdfIBM Research, Yorktown Heights, New York AND JOHN REIF Harvard University, Cambridge, Massachusetts IN MEMORY OF ALFRED TARSKI, 1902—1983