most probable distribution (in macromolecular assemblies)

A discrete distribution with the differential mass-distribution function of the form:
f w x = a 2 x ( 1 − a ) x − 1
where x is a parameter characterizing the chain length, such as relative molecular mass or degree of polymerization and a is a positive adjustable parameter. For large values of x, the most probable distribution converges to the particular case of the Schulz–Zimm distribution with b = 1. In the literature, this distribution is sometimes referred to as the Flory distribution or the Schulz–Flory distribution.
Source:
Purple Book, p. 56