... Columbia University, and the University of Pennsylvania, and was a member of the Society of Fellows of Harvard University. He is the author of several books, including Schaum&apos ;s Outline of Boolean ... Boolean Algebra and Switching Circuits. His principal area of research is mathematical logic and set theory. Schaum&apos ;s Outline of Theory and Problems of BEGINNING CALCULUSCopyright © 1997,1985 ... Now let us see how the slope varies with the “steepness” of the line. First let us consider lines with positive slopes, passing through a fixed point P,(x,, yJ. One such line is shown in...