This quantity corresponds to hue rather than saturation or brightness in a visualization method called domain coloring. A result named for this quantity is invoked to compute a function nt (“n-sub-t”), which is both continuous and integer-valued and thus constant, in a standard proof of Rouche’s theorem. A formula named for this quantity sets the contour integral of “f prime over f” proportional to the number of zeros (-5[2])minus (-5[1])the number of poles of f within a (-5[1])region. This quantity is restricted (15[1])to an interval (-5[1])when defining the (*) complex logarithm to avoid non-uniqueness. (10[1]-5[2])As a curve is traced, (10[1]-5[1])a jump in this quantity (10[1])by its usual upper bound yields an increase of one (10[1])in the winding number. This quantity is denoted (10[1])phi in the expression (10[1])“z equals r (-5[1])times (10[1])e to the i phi.” (10[1])For 10 points, (10[1])name this quantity that, along with the magnitude, parametrizes (10[1]-5[1])a complex number. (10[2])■END■ (10[7]0[2])