 In the exact solution of the Einstein equations, the powers "pl", "pm", "pn" lose their original, precise, sense.This circumstance introduces some "fuzziness" in the determination of these numbers (and together with them, to the parameter "u") which, although small, makes meaningless the analysis of any definite (for example, [[Rational number|rational]]) values of "u".Therefore, only these laws that concern arbitrary irrational values of "u" have any particular meaning.