A standard approach to calculate the roots of a univariate polynomial is compute eigenvalues an associated confederate matrix instead, such as, for instance, companion or comrade matrix. The can be computed by Francis's QR algorithm. Unfortunately, even though algorithm provably backward stable, mapping errors back original coefficients still lead huge errors. However, latter statement assumes ...

Starting from some simple observations on a popular selection method in Evolutionary Algorithms (EAs)—tournament selection—we highlight a previously-unknown source of inefficiency. This leads us to rethink the order in which operations are performed within EAs, and to suggest an algorithm—the EA with efficient macro-selection—that avoids the inefficiencies associated with tournament selection. ...

Backward and Feebleminded Children. By Edmund Burke Huey. Baltimore Warwick and York, 1912. Pp. xiii-j-221. Illus. "Years ago at Heidelberg," writes Dr. Huey, "Professor Kraepelin told me, with enthusiasm which I well remember, how much he thought might come from an intensive clinical study of a group of some thirty school children. On my way to Lincoln, Dr. Adolf Meyer encouraged me to underta...

The Backward Baby. By Herman B. Sheffield, M.D. New York: Rebman Co., 1915. Pp. vi+186 (illustrated). This "treatise on idiocy and the allied mental deficiencies in infancy and early childhood," was awarded the Alvarenga prize of the College of Physicians of Philadelphia, July 14, 1914. The author's aim "is to present to the profession a practical survey of the etiology, pathology, diagnosis, a...

nN backward scattering data above 5 GeV /c are analyzed in terms of the baryon Regge pole exchange and accompanying Regge cut due to the strong absorption. The fit of the cross sections is reasonable. The role of the cut turns out to be very important: (1) The extrapolated magnitude of the L10 residue at a 4 =! is significantly larger than that without the cut. Ll0 residue with or without the w...