Sheffer, H. M. (1913), “A set of five independent postulates for Boolean algebras, with application to logical constants”, Transactions of the American Mathematical Society, 14: 481–488

]]>Sheffer, H. M. (1913), “A set of five independent postulates for Boolean algebras, with application to logical constants”, Transactions of the American Mathematical Society, 14: 481–488

]]>Sure, just change the base to the LCD and then you can synthesize multiplication with addition again. This is the same idea that makes the slide rule so powerful.

]]>Both forms of the quadratic can be derived from solving for the two roots in

x^2 + b/a x + c/a= (x-r1)(x-r2), given that (r1- r2)^2=(r1+r2)^2-4r1r2 and that c/a= r1r2 and b/a= -(r1+r2)