Dagfinn Føllesdal (born 22 June 1932) is the Clarence Irving Lewis Professor of Philosophy at Stanford University, and professor emeritus at the University of Oslo.
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Cooper Harold Langford (25 August 1895, Dublin, Logan County, Arkansas – 28 August 1964) was an analytic philosopher and mathematical logician who co-authored the book Symbolic Logic (1932) with C. I. Lewis.