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Peter Karl Henrici | |
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Peter Henrici (middle), Washington D.C. 1953 | |

Born | |

Died | 13 March 1987 63) | (aged

Nationality | Switzerland |

Alma mater | ETH Zürich |

Known for | Numerical analysis |

Scientific career | |

Fields | Mathematics |

Institutions | University of California, Los Angeles; ETH Zürich; University of North Carolina at Chapel Hill |

Doctoral advisor | Eduard Stiefel |

Doctoral students | Gilbert Strang, William B. Gragg |

**Peter Karl Henrici** (13 September 1923 – 13 March 1987) was a Swiss mathematician best known for his contributions to the field of numerical analysis.

**Switzerland**, officially the **Swiss Confederation**, is a sovereign state situated in the confluence of western, central, and southern Europe. It is a federal republic composed of 26 cantons, with federal authorities seated in Bern. Switzerland is a landlocked country bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. It is geographically divided between the Alps, the Swiss Plateau and the Jura, spanning a total area of 41,285 km^{2} (15,940 sq mi), and land area of 39,997 km^{2} (15,443 sq mi). While the Alps occupy the greater part of the territory, the Swiss population of approximately 8.5 million is concentrated mostly on the plateau, where the largest cities are located, among them the two global cities and economic centres of Zürich and Geneva.

A **mathematician** is someone who uses an extensive knowledge of mathematics in his or her work, typically to solve mathematical problems.

**Numerical analysis** is the study of algorithms that use numerical approximation for the problems of mathematical analysis. Numerical analysis naturally finds application in all fields of engineering and the physical sciences, but in the 21st century also the life sciences, social sciences, medicine, business and even the arts have adopted elements of scientific computations. The growth in computing power has revolutionized the use of realistic mathematical models in science and engineering, and subtle numerical analysis is required to implement these detailed models of the world. For example, ordinary differential equations appear in celestial mechanics ; numerical linear algebra is important for data analysis; stochastic differential equations and Markov chains are essential in simulating living cells for medicine and biology.

Henrici was born in Basel and studied law for two years at University of Basel. After World War II he transferred to ETH Zürich where he received a diploma in electrical engineering (1948) and a doctorate in mathematics with Eduard Stiefel as his advisor (1952).

**Basel** or **Basle** is a city in northwestern Switzerland on the river Rhine. Basel is Switzerland's third-most-populous city with about 180,000 inhabitants.

The **University of Basel** is located in Basel, Switzerland. Founded on 4 April 1460, it is Switzerland's oldest university and among the world's oldest surviving universities. The university is traditionally counted among the leading institutions of higher learning in the country.

**World War II**, also known as the **Second World War**, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from more than 30 countries. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 70 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war.

In 1951 he moved to the United States and worked on a joint contract with American University and the National Bureau of Standards. Then, from 1956 to 1962, he taught at University of California, Los Angeles where he became a professor. In 1962 he returned to ETH Zürich as a professor, a position he kept for the rest of his life, though he also held a part-time appointment as William R. Kenan, Jr. Distinguished Professor of Mathematics at the University of North Carolina at Chapel Hill from 1985.^{ [1] }^{ [2] }

The **American University** is a private research university in Washington, D.C. Its main campus spans 90 acres at the former site of Fort Gaines on Ward Circle, in the Spring Valley neighborhood in the northwest of the District. AU was chartered by an Act of Congress in 1893 at the urging of Methodist bishop John Fletcher Hurst, who sought to create an institution that would promote public service, internationalism, and pragmatic idealism. AU broke ground in 1902, opened in 1914, and admitted its first undergraduates in 1925. Although affiliated with the United Methodist Church, religious affiliation is not a criterion for admission.

The **University of California, Los Angeles** (**UCLA**), is a public research university in Los Angeles. It became the Southern Branch of the University of California in 1919, making it the fourth-oldest of the 10-campus University of California system. It offers 337 undergraduate and graduate degree programs in a wide range of disciplines. UCLA enrolls about 31,000 undergraduate and 13,000 graduate students and had 119,000 applicants for Fall 2016, including transfer applicants, making the school the most applied-to of any American university.

**Professor** is an academic rank at universities and other post-secondary education and research institutions in most countries. Literally, *professor* derives from Latin as a "person who professes" being usually an expert in arts or sciences, a teacher of the highest rank.

An internationally recognized numerical analyst, who published 11 books and more than 80 research papers, Henrici was also a gifted pianist and a highly regarded teacher.^{ [1] } He was an editor of a number of scientific journals, including * Numerische Mathematik * and * Zeitschrift für Angewandte Mathematik und Physik *. In 1962, he was a speaker at the International Congress of Mathematicians, and in 1978 he gave the SIAM John von Neumann Lecture.^{ [2] }

* Numerische Mathematik* is a peer-reviewed mathematics journal on numerical analysis. It was established in 1959 and is published by Springer Science+Business Media. The journal is indexed by

The * Zeitschrift für Angewandte Mathematik und Physik* is a bimonthly peer-reviewed scientific journal published by Birkhäuser Verlag. The editor-in-chief is Kaspar Nipp. It was established in 1950 and covers the fields of fluid mechanics, solid mechanics, differential equations/applied mathematics, and related topics. According to the

The **International Congress of Mathematicians** (**ICM**) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU).

Every four years since 1999, the Peter Henrici Prize is awarded by ETH Zürich and SIAM for "original contributions to applied analysis and numerical analysis and/or for exposition appropriate for applied mathematics and scientific computing".^{ [3] }

- Henrici, Peter (1962).
*Discrete variable methods in ordinary differential equations*. Wiley.

- Henrici, Peter (1963).
*Error propagation for difference methods*. SIAM series in applied mathematics. Wiley.

- Henrici, Peter (1964).
*Elements of numerical analysis*. Wiley.

- Henrici, Peter (1974).
*Applied and computational complex analysis, Volume 1: Power series—integration—conformal mapping—location of zeros*. Wiley. ISBN 0-471-37244-7.

- Henrici, Peter (1977).
*Applied and computational complex analysis, Volume 2: Special functions—integral transforms—asymptotics—continued fractions*. Wiley. ISBN 0-471-01525-3. - Henrici, Peter (1977).
*Computational Analysis with the HP-25 Pocket Calculator*. Wiley. ISBN 0-471-02938-6. - Henrici, Peter (1986).
*Applied and computational complex analysis, Volume 3: Discrete Fourier analysis—Cauchy integrals—construction of conformal maps—univalent functions*. Wiley. ISBN 0-471-08703-3.

**George Pólya** was a Hungarian mathematician. He was a professor of mathematics from 1914 to 1940 at ETH Zürich and from 1940 to 1953 at Stanford University. He made fundamental contributions to combinatorics, number theory, numerical analysis and probability theory. He is also noted for his work in heuristics and mathematics education. He has been described as one of The Martians.

**Björn Engquist** has been a leading contributor in the areas of multiscale modeling and scientific computing, and a productive educator of applied mathematicians.

**Alston Scott Householder** was an American mathematician who specialized in mathematical biology and numerical analysis.

**Dimitrie D. Pompeiu** was a renowned Romanian mathematician.

**Stefan Bergman** was a Polish-born American mathematician whose primary work was in complex analysis. His name is also written **Bergmann**; he dropped the second "n" when he came to the U. S. He is best known for the kernel function he discovered while at Berlin University in 1922. This function is known today as the Bergman kernel. Bergman taught for many years at Stanford University, and served as an advisor to several students.

**Walter Gautschi** is a Swiss-American mathematician, known for his contributions to numerical analysis. He has authored over 200 papers in his area and published four books.

**Peter Wynn** is a mathematician. His main achievements concern approximation theory – in particular the theory of Padé approximants – and its application in numerical methods for improving the rate of convergence of sequences of real numbers.

**Heinz Rutishauser** was a Swiss mathematician and a pioneer of modern numerical mathematics and computer science.

**Ernst Hairer** is a professor of mathematics at the University of Geneva known for his work in numerical analysis.

**John George Herriot** was a mathematician at Stanford university who worked on numerical analysis.

**Eitan Tadmor** is a distinguished university professor at the University of Maryland, College Park, known for his contributions to the theory and computation of PDEs with diverse applications to shock wave, kinetic transport, incompressible flows, image processing, and self-organized collective dynamics.

**Franco Brezzi** is an Italian mathematician.

**Annalisa Buffa** is an Italian mathematician, specializing in numerical analysis and PDEs.

**Albert Pfluger** was a Swiss mathematician, specializing in complex function theory.

**Alexander Andreevich Samarskii** was a Soviet and Russian mathematician and academician, specializing in mathematical physics, applied mathematics, numerical analysis, mathematical modeling, finite difference methods.

**Hans Jörg Stetter** is a German mathematician, specializing in numerical analysis.

**Volker Ludwig Mehrmann** is a German mathematician.

**Beresford Neill Parlett** is an applied mathematician, specializing in numerical analysis and scientific computation.

**Peter Bürgisser** is a German mathematician and theoretical computer scientist who deals with algorithmic algebra and algebraic complexity theory.

- 1 2 Golub, Gene H.; Varga, Richard S. (1988). "Obituary to Peter Henrici (13 September 1923 – 13 March 1987)".
*Numerische Mathematik*.**52**(5): 481–482. doi:10.1007/BF01400886. - 1 2 O'Connor, John J.; Robertson, Edmund F., "Peter K. Henrici",
*MacTutor History of Mathematics archive*, University of St Andrews . - ↑ "Peter Henrici Prize (with ETH Zurich)". Society for Industrial and Applied Mathematics . Retrieved 2 June 2011.

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