منابع مشابه
Derrick Tilton Vail.
Derrick Tilton Vail was born in Cincin nati, Ohio, May 15, 1898, the son of Der rick and Delia Harriss Vail and the middle of five children. During his adolescent years he resented this position as his two older brothers continually ganged up to make him babysit for the two younger sisters (fig. 1). He went to a very small private school where he was a member of every athletic team—an accompl...
متن کاملRepunit Lehmer numbers
A Lehmer number is a composite positive integer n such that φ(n) | n− 1. In this paper, we show that given a positive integer g > 1 there are at most finitely many Lehmer numbers which are repunits in base g, and they are all effectively computable. Our method is effective and we illustrate it by showing that there is no such Lehmer number when g ∈ [2, 1000]. 2000 Mathematics Subject Classifica...
متن کاملAn Indian adventure: Derrick Vail's Shikarpur fragments.
S hortly after completing his residency training at the Massachusetts Eye and Ear Infirmary, Derrick Vail, Jr, MD (1898-1973) (Figure 1), traveled to India to work at a missionary hospital and perfect his surgical skills. His father, Derrick Vail, Sr, MD (18641930) (Figure 2), also a highly respected ophthalmologist, accompanied him, as did their wives. Vail’s description of the expedition, whi...
متن کاملHenry Ormerod
at the age of 68, belonged to a family of surgeons. He was educated at the Bristol Royal Infirmary and Medical School, and very soon after qualifying he settled at Westbury. Although his capacity for work was immense, yet in the early years of his practice he had more than one attack of haemoptysis, and it was his opinion that leading a country open-air life had been the means of warding off mo...
متن کاملHenry Wellcome
fo'c'sle-study running his naval household with the aid of an Admiralty of natural history suppliers and breeders, as well as experts like Lyell, Hooker and the young Huxley in every port. Beatrice Webb once likened Herbert Spencer to a spider collecting facts on the theoretical web he was spinning; the image equally well suits Darwin. A pleasure to read, this exciting new biography deepens our...
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ژورنال
عنوان ژورنال: Acta Arithmetica
سال: 1992
ISSN: 0065-1036,1730-6264
DOI: 10.4064/aa-62-3-207-220