Characteristic 13. Some readers may ask how axiom 3 differs from the usual mathematical operations, such as calculus. We now describe space as a mathematical model that can compare the size, boundless, infinitesimal extension that gradually approaches infinity. For example, for a given line segment or high-dimensional surface, we define it as a manifold that can be infinitely and arbitrarily divided into smaller parts. The concept of infinite and arbitrary division is equal to the gradual extension and superpositions from the infinitesimal to the infinite great. Here, a certain line segment or surface is understood as a set of innumerable infinitesimals and can be calculated similar to calculus. From the definition of axiom 3, it can be seen that this is not a fact. Space is a continuum extending to infinity. There is only one quantitative continuum, which cannot be divided or expanded into smaller or larger parts, and it cannot be added, subtracted, multiplied or divided. It is also meaningless to divide this quantitative continuum into a given line segment or surface. For example, for π, to obtain its definite value, the approaching extension of the sequential (or continuous) form cannot reach the infinite definite value and can only stay in a finite quantity range. It must experience a jump representing the infinite accumulation of finity by the form of the change in the direction and obtain its infinite definite value. In any case, by then, this value has become one quantitative continuum representing the infinitely many accumulations of finite quantities.