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The cube root rule or cube root law is an observation in political science that the number of members of a unicameral legislature, or the lower house of a bicameral legislature, is about the cube root of the population being represented. The rule was devised by Rein Taagepera in his 1972 paper "The size of national assemblies".

Here the function is f(x) = (x3 + 3x2 − 6x − 8)/4. In algebra, a cubic equation in one variable is an equation of the form. a x 3 + b x 2 + c x + d = 0 {\displaystyle ax^ {3}+bx^ {2}+cx+d=0} in which a is nonzero. The solutions of this equation are called roots of the cubic function defined by the left-hand side of the equation.

The volume of a geometric cube is the cube of its side length, giving rise to the name. The inverse operation that consists of finding a number whose cube is n is called extracting the cube root of n. It determines the side of the cube of a given volume. It is also n raised to the one-third power. The graph of the cube function is known as the ...

The cube is the only regular hexahedron and is one of the five Platonic solids. It has 6 faces, 12 edges, and 8 vertices. The cube is also a square parallelepiped, an equilateral cuboid and a right rhombohedron a 3 - zonohedron. It is a regular square prism in three orientations, and a trigonal trapezohedron in four orientations.