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The problem of 1/f noise has been with us for about a century. Because it isso often framed in Fourier spectral language, the most famous solutions havetended to be the stationary long range dependent (LRD) models such asMandelbrot's fractional Gaussian noise. In view of the increasing importance tophysics of non-ergodic fractional renewal models, I present preliminary resultsof my research into the history of Mandelbrot's very little known work in thatarea from 1963-67. I speculate about how the lack of awareness of this work inthe physics and statistics communities may have affected the development ofcomplexity science, and I discuss the differences between the Hurst effect, 1/fnoise and LRD, concepts which are often treated as equivalent.

Mandelbrot's 1/f fractional renewal models of 1963-67: The non-ergodic missing link between change points and long range dependence