Andrew Hurst Henderson, 1930–2017

Estimating the Hurst Exponent

The Hurst Exponent is a dimensionless estimator for the self-similarity of a time series. Initially defined by Harold Edwin Hurst to develop a law for regularities of the Nile water level, it now has applications in medicine and finance. Meaningful values are in the range [0, 1]. Different methods for estimating the Hurst Exponent have been evaluated: The classical “Rescaled Range” method devel...

David Willis Wilson Henderson, 1903-1968.

Andrew Ford

This paper describes simulated scenarios for power plant construction in the western United States. The simulations show construction lagging behind the growth in demand, allowing prices to climb to surprisingly high values during the years 2000 and 2001. When construction is completed, new power plants come on line in great number, allowing market prices to fall surprisingly rapidly in the yea...

Andrew Travers

kinds of molecules can also work as recruiters. Double-stranded RNA, for example, directs the RNA interference machinery to specific sequences in mRNA and in DNA, and thereby regulates a form of gene silencing. Signals typically are conveyed to recruiters and, as implied by the discussion thus far, not to the enzymatic machineries themselves. For example, the sugar galactose (which we’ll call a...

Andrew Granville )

On the 800th anniversary of the publication of Liber Abaci, I wish to draw the attention of the reader to some of my favorite facts about Fibonacci numbers concerning squares, multiples of squares and powerful numbers amongst the Fibonacci numbers.