詹姆斯·莱特希尔1924—1998

生平

莱特希尔出生于法国巴黎，1943年毕业于剑桥大学三一学院。1946年至1959年间，担任曼彻斯特维多利亚大学拜尔应用数学教授。此后曾任皇家航空研究院主任。1964年，出任伦敦帝国学院的皇家学会常任教授。五年之后他回到母校剑桥大学，接替保罗·狄拉克出任卢卡斯数学教授。1979年斯蒂芬·霍金接替了他的卢卡斯教授席位，他则前往伦敦大学学院任教务长。

莱特希尔获得过皇家奖章（1964年）、艾利奥特·克雷森奖章（1975年）、数学及其应用学会金质奖章（1982年）、德维希·普朗特指环（1983年）、科普利奖章（1998年）等众多荣誉。

1998年，莱特希尔在萨克岛游泳时因心脏病发去世，终年74岁。

Sir Michael James Lighthill (23 January 1924 – 17 July 1998) was a British applied mathematician, known for his pioneering work in the field of aeroacoustics and for writing the Lighthill report in 1973, which pessimistically stated that "In no part of the field (of AI) have the discoveries made so far produced the major impact that was then promised", contributing to the gloomy climate of AI winter.

Education and early life

James Lighthill was born to Ernest Balzar Lichtenberg and Marjorie Holmes: an Alsatian mining engineer who changed his name to Lighthill in 1917, and the daughter of an engineer. The family lived in Paris until 1927, when the father retired and returned to live in England. As a young man, James Lighthill was known as Michael Lighthill.

Lighthill was educated at Winchester College, and graduated with a Bachelor of Arts degree from the University of Cambridge where he was an undergraduate student of Trinity College, Cambridge in 1943.

Career and research

Lighthill specialised in fluid dynamics, and worked at the National Physical Laboratory. Between 1946 and 1959 he was Beyer Professor of Applied Mathematics at the University of Manchester. Lighthill then moved from Manchester to become director of the Royal Aircraft Establishment at Farnborough. There he worked on the development of television and communications satellites, and on the development of crewed spacecraft. This latter work was used in the development of the Concorde supersonic airliner.

In 1955, together with Gerald B. Whitham, Lighthill set out the first comprehensive theory of kinematic waves (an application of the method of characteristics), with a multitude of applications, prime among them fluid flow and traffic flow.

Lighthill's early work included two-dimensional aerofoil theory, and supersonic flow around solids of revolution. In addition to the dynamics of gas at high speeds, he studied shock and blast waves and introduced the squirmer model. He is credited with founding the subject of aeroacoustics, a subject vital to the reduction of noise in jet engines. Lighthill's eighth power law states that the acoustic power radiated by a jet engine is proportional to the eighth power of the jet speed. He also founded non-linear acoustics, and showed that the same non-linear differential equations could model both flood waves in rivers and traffic flow in highways.

In 1964 he became the Royal Society's resident professor in Imperial College London, before returning to Trinity College, Cambridge, five years later as Lucasian Professor of Mathematics, a chair he held until 1979, when he was succeeded by Stephen Hawking. Lighthill then became Provost of University College London (UCL) – a post he held until 1989.

Lighthill founded the Institute of Mathematics and its Applications (IMA) in 1964, alongside Professor Sir Bryan Thwaites. In 1968, he was awarded an Honorary Degree (Doctor of Science) by the University of Bath. In 1972 he was invited to deliver the MacMillan Memorial Lecture to the Institution of Engineers and Shipbuilders in Scotland. He chose the subject "Aquatic Animal Locomotion".

In the early 1970s, partly in reaction to significant internal discord within that field, the Science Research Council (SRC), as it was then known, asked Lighthill to compile a review of academic research in Artificial Intelligence. Lighthill's report, which was published in 1973 and became known as the "Lighthill report", was highly critical of basic research in foundational areas such as robotics and language processing, and "formed the basis for the decision by the British government to end support for AI research in all but two universities", starting what is sometimes referred to as the "AI winter".

In 1982, Lighthill and Alan B. Tayler were jointly awarded the first ever Gold Medal of the Institute of Mathematics and its Applications in recognition of their "outstanding contributions to mathematics and its applications over a period of years".

Personal life

His hobby was open-water swimming. He died in the water in 1998 when the mitral valve in his heart ruptured while he was swimming round the island of Sark, a feat which he had accomplished many times before.

Collections

Lighthill's archive is held at University College London Special Collections; it was given by the Mathematics Department in 2008. The collection spans over 120 boxes and contains working papers, lecture notes, publications, correspondence and personal papers from Lighthill, primarily from the 1970s - 1990s.