Biography:Walter Hayman

Short description: British mathematician (1926–2020)

Walter Hayman
Born	Walter Kurt Hayman Cologne, Germany
Died	1 January 2020(2020-01-01) (aged 93)
Nationality	British
Education	University of Cambridge
Known for	Theory of subharmonic functions Univalent function theory
Spouse(s)	Margaret Hayman (née Crann)
Awards	Berwick Prize (1955) Senior Berwick Prize (1964) De Morgan Medal (1995)
Scientific career
Fields	Complex analysis
Institutions	King's College, Newcastle University of Exeter Imperial College
Website	www3.imperial.ac.uk/people/w.hayman

Walter Kurt Hayman FRS (6 January 1926 – 1 January 2020) was a British mathematician known for contributions to complex analysis. He was a professor at Imperial College London.

Life and work

Hayman was born in Cologne, Germany , the son of Roman law professor Franz Haymann (1874-1947) and Ruth Therese Hensel, daughter of mathematician Kurt Hensel. He was a great-grandson of acclaimed composer Fanny Mendelssohn. Because of his Jewish heritage, he left Germany, then under Nazi rule, alone by train in 1938. He continued his schooling at Gordonstoun School, and later at St John's College, Cambridge under John Edensor Littlewood and his doctoral advisor Mary Cartwright. He taught at King's College, Newcastle, and the University of Exeter.

In 1947, he married Margaret Riley Crann: together, they founded the British Mathematical Olympiad.

He is known for his asymptotic results in Bieberbach conjecture in 1955, and for Hayman's alternatives in Nevanlinna Theory. His work with Wolfgang Fuchs gave a solution to an inverse problem of the Nevanlinna theory for entire functions, predating David Drasin's 1976 work.

Honours and awards

Hayman was elected to the Royal Society in 1956 and of the Finnish Academy of Science and Letters in 1978: he was elected "Foreign member" of the Accademia dei Lincei on 16 December 1985. In 1992 he received an honorary doctorate from the Faculty of Mathematics and Science at Uppsala University, Sweden In 1995 he was awarded the De Morgan Medal by the London Mathematical Society. In 2008, an issue of the Journal Computational Methods and Function Theory was dedicated to him on the occasion of his 80th birthday.

Selected publications

Hayman presents a talk at the 2010 One Day Function Theory Meeting.

Papers

• Hayman, W. K. (1952), "Functions with values in a given domain", Proceedings of the American Mathematical Society 3 (3): 428–432, doi:10.1090/S0002-9939-1952-0049323-9 .
• Hayman, W. K. (1974), "The local growth of power series: a survey of the Wiman-Valiron method", Canadian Mathematical Bulletin 17 (3): 317–358, doi:10.4153/CMB-1974-064-0 .
• Hayman, W. K.; Rossi, J. F. (1984), "Characteristic, maximum modulus and value distribution", Transactions of the American Mathematical Society 284 (2): 651–664, doi:10.1090/S0002-9947-1984-0743737-2 .
• Hayman, Walter K. (1993), "A problem on Fourier series arising from an Isoperimetric inequality", in Ricci, Paolo Emilio, Problemi attuali dell'analisi e della fisica matematica. Atti del simposio internazionale dedicato a Gaetano Fichera nel suo 70^o compleanno. Taormina, 15–17 ottobre 1992, Roma: Dipartimento di Matematica Università di Roma La Sapienza – Aracne Editrice, pp. 119–125 .
• Hayman, W. K. (2002), "Univalent and Multivalent Functions", in Kuhnau, Reiner, Geometric Function Theory, Handbook of Complex Analysis, 1, Amsterdam: North-Holland, pp. 1–36, ISBN 978-0-444-82845-3 .

Books

• Hayman, W. K. (1964), Meromorphic functions, Oxford Mathematical Monographs, Oxford: Clarendon Press, pp. XIV+191 .
• Hayman, W. K. (1967), Research Problems in Function Theory, London: Athlone Press, pp. vii+56 .
• Hayman, W. K.; Kennedy, P. B. (1976), Subharmonic functions. Volume 1, London Mathematical Society Monographs, 9, London–New York: Academic Press, pp. XVII+284, ISBN 978-0-12-334801-2 .
• Hayman, W. K. (1988), Subharmonic functions. Volume 2, London Mathematical Society Monographs, 20, London: Academic Press, pp. xiii+875, ISBN 978-0-12-334802-9 .
• Hayman, W. K. (1994), Multivalent functions, Cambridge Tracts on Mathematics, 110 (Second ed.), Cambridge: Cambridge University Press, pp. xii+263, ISBN 978-0-521-46026-2 .
• Hayman, W. K. (2014), My Life and Functions, Logic Press, pp. iv+138, ISBN 978-1-326-03020-9 
• Hayman, W. K.; Lingham, E. F. (2019), Research Problems in Function Theory - Fiftieth Anniversary Edition, Problem Books in Mathematics, Springer, pp. VIII+284, ISBN 978-3-030-25164-2 

References

Biographical references

• Accademia Nazionale dei Lincei (2012) (in it), Annuario dell'Accademia Nazionale dei Lincei 2012 – CDX dalla Sua Fondazione, Roma: Accademia Nazionale dei Lincei, pp. 734, http://www.lincei.it/files/doc/ANL_Annuario_2012.pdf, retrieved 6 December 2014 . The "Yearbook" of the renowned Italian scientific institution, including an historical sketch of its history, the list of all past and present members as well as a wealth of information about its academic and scientific activities.
• Quadling, Douglas (1995), "Obituary: Margaret Hayman", The Mathematical Gazette 79 (484): 127, doi:10.1017/S0025557200147813 .
• Finnish Academy of Science and Letters (2014), Ulkomaiset jäsenet – Foreign Members, http://www.acadsci.fi/jasenet/ulkomaiset_jasenet.htm, retrieved 2014-12-21 .

General references

• Drasin, David (May 2015), "My Life and Functions by Walter K. Hayman", Notices of the American Mathematical Society 68 (5): 517–520, doi:10.1090/noti1250 . The review of the autobiographical book of Hayman.
• Ruscheweyh, S., ed. (2008), "Special Volume. Dedicated to Walter K. Hayman on the occasion of his 80th birthday", Computational Methods and Function Theory (Lemgo) 8 (1–2): xliii+640, ISSN 1617-9447, https://link.springer.com/journal/40315/8/1/page/1  (online ISSN 2195-3724).

External links

• O'Connor, John J.; Robertson, Edmund F., "Walter Hayman", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Hayman.html .
• Walter Hayman at the Mathematics Genealogy Project
• Obituary at the London Mathematical Society