1. Friedrichs Kurt Otto Friedrichs. Born 28 Sept 1901 Kurt Friedrichs solved a problem in relativity while still at school. His dissertation on the http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Friedrichs.html

Kurt Otto Friedrichs Born: 28 Sept 1901 in Kiel, Germany Died: 31 Dec 1982 in New Rochelle, New York, USA Click the picture above to see a larger version Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Kurt Friedrichs solved a problem in relativity while still at school. His dissertation on the theory of elastic plates was written under Courant Courant 's assistant and helped with the Courant Hilbert book. Friedrichs went to Aachen in 1929 and became professor in Braunschweig in 1932. His main work was on partial differential equations in mathematical physics. He used finite differences to prove existence of solutions. Friedrichs also worked on fluid dynamics. His girlfriend was Jewish so from 1933 he experienced problems. He went to the USA in 1937 to join Courant who had emigrated earlier, and was joined by his girlfriend whom he married. Article by: J J O'Connor and E F Robertson Click on this link to see a list of the Glossary entries for this page A Reference (One book/article) Mathematicians born in the same country Honours awarded to Kurt Friedrichs (Click a link below for the full list of mathematicians honoured in this way) AMS Gibbs Lecturer Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index History Topics Societies, honours, etc.

2. I Concetti Matematici Elementari Della Fisica,dal Teorema Di Pitagora Allo Spazi Translate this page friedrichs kurt O. Casa editrice Universale scientifica Boringhieri. Anno 1967. Pagine 120. Copertina morbida. ISBN 0. Prezzo 0 Euro. http://www.mathology.net/mathology/vis_libro.asp?id=6&lang=ita

3. Matematica Applicata Translate this page di friedrichs kurt O. Universale scientifica Boringhieri, 1967, Ricerca. Tutte. Articolo Random. Prossimamente. Congetture. http://www.mathology.net/mathology/vis_Categoria.asp?id=22

4. Hinduismus Taoismus. Zen. FischerSchreiber Ingrid, Ehrhard Franz-Karl, friedrichs kurt (Hrsg.) 2.Aufl. der Sonderausgabe Bern/München/Wien 1994. (497 S.) geb.. http://www.manava.ch/hinduismus.html

Religionen / Indologie HINDUISMUS Kinsley David: Hindu Goddesses. Visions of the Divine Feminine in the Hindu Religious Tradition. California 1986. First Indian Ed. 1987. (281 p., 15 illustr.) Bound1. [Nr.3235, Hindu Goddesses: Fr.11.-] Munshi K.M.: Krishnavatara III. The Five Brothers. Bombay. 1972. (370 P.) PB. [Nr.4811, Five Brothers: Fr. 5.-] Munshi K.M.: Krishnavatara I. The Magic Flute. Bombay. 1972. (249 S.) PB. [Nr.5604, Magic Flute: Fr. 4.-] Sukumari Bhattacharji: Legends of Devi. Illustrations by Ramananda Bandapadhyay. Calcutta 1995. (118 p., illustr.) Bound. [Nr.957, Legends of Devi: Fr.21.-] Shet Noel S.J.: The Divinity of Krishna. Delhi 1984. (179 p.) Bound. [Nr.358, Divinity of Krishna: Fr.11.-] Rigopulos, Antonio: The life and teachings of Sai Baba of Shirdi. Delhi 1993. (466 p., 7 ills., 1 map, bib., ind.) Bound. [Nr.4688, Sai Baba of Shirdi: Fr.16.-] Shri Purohit Swami: The Autobiography of an Indian Monk. With an introd. by W.B.Yeats and ed. with an essay on the autor by Vinod Sena. Delhi 1992, 1.indian Ed. (London 1932) (160 p., 9 illustr.) Bound. [Nr.918, Autobiography Monk: Fr.13.-] Sadhana. The Inward Path. Quotations from the divine discourses of Bagavan Sri Sathya Sai Baba. Sri Sathya Sai Education and Publication Foundation 1978. (261 S.) PB. [Nr.1126, Inward Path: Fr.4.-]

5. The Friedrichs Family Home Page Nellie, kurt, Walter, Liska, David, Christopher and Martin. History, genealogy, photos, and travel reports. http://www.friedrichs.us/

WELCOME TO THE FRIEDRICHS FAMILY HOME PAGE This web site is dedicated to the memory of Nellie and Kurt Friedrichs It is to be used to further tie their expanding set of relatives and decendents together Click on this picture of 24 Lester Pl. any time you see it to return to this home page MAJOR SITE SECTIONS - Individual member pages - Genealogy - Travel reports - E-mails to remember ... - Shared interest topics HOT - NEW - UPDATED - TOPICS Tazlina April 2004 Skiing Snowbird - Silverton Jan 2004 Siswi and Jonathan - Mr. November Turtle Trickle revitalized Nov. 2003 ... 2004 Reunion - Agenda updated (6/1) Click on underlined words to go to that section of the site Click here to Email Martin with questions or comments

6. Biography-center - Letter F s=g p=c a=b ID=19. friedrichs, kurt. wwwhistory.mcs.st-and.ac.uk/~history/ Mathematicians/friedrichs.html. Frisch, Karl von http://www.biography-center.com/f.html

Visit a random biography ! Any language Arabic Bulgarian Catalan Chinese (Simplified) Chinese (Traditional) Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Norwegian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Turkish F 450 biographies www-history.mcs.st-and.ac.uk/~history/Mathematicians/Faa_di_Bruno.html Faber, Knud Helge www.whonamedit.com/doctor.cfm/464.html Fabi, Corrado www.grandprix.com/gpe/drv-fabcor.html Fabi, Teo www.grandprix.com/gpe/drv-fabteo.html Fabian (Crockaert), Lara www.askmen.com/women/singer/44_lara_fabian.html Fabian (Crockaert), Lara membres.lycos.fr/larafabian1/lara.html Fabray, Nanette www.wic.org/bio/nfabray.htm Fabre, François-Xavier www.getty.edu/art/collections/bio/a621-1.html www-history.mcs.st-and.ac.uk/~history/Mathematicians/Fabri.html Fabriano, Gentile da www.ibiblio.org/wm/paint/auth/gentile/ Fabricius, Cared www.kfki.hu/~arthp/bio/f/fabritiu/biograph.html Fabry, Johannes www.whonamedit.com/doctor.cfm/467.html Faggin, Federico

7. Friedrichs Biography of kurt friedrichs (19011982) kurt Otto friedrichs. Born 28 Sept 1901 in Kiel, Germany kurt friedrichs solved a problem in relativity while still at school http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Friedrichs.html

Kurt Otto Friedrichs Born: 28 Sept 1901 in Kiel, Germany Died: 31 Dec 1982 in New Rochelle, New York, USA Click the picture above to see a larger version Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Kurt Friedrichs solved a problem in relativity while still at school. His dissertation on the theory of elastic plates was written under Courant Courant 's assistant and helped with the Courant Hilbert book. Friedrichs went to Aachen in 1929 and became professor in Braunschweig in 1932. His main work was on partial differential equations in mathematical physics. He used finite differences to prove existence of solutions. Friedrichs also worked on fluid dynamics. His girlfriend was Jewish so from 1933 he experienced problems. He went to the USA in 1937 to join Courant who had emigrated earlier, and was joined by his girlfriend whom he married. Article by: J J O'Connor and E F Robertson Click on this link to see a list of the Glossary entries for this page A Reference (One book/article) Mathematicians born in the same country Honours awarded to Kurt Friedrichs (Click a link below for the full list of mathematicians honoured in this way) AMS Gibbs Lecturer Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index History Topics Societies, honours, etc.

8. Friedrichs Portrait kurt friedrichs. JOC/EFR September 2003 The URL of this page is © Copyright information. http//wwwhistory.mcs.st-andrews.ac.uk/PictDisplay/friedrichs.html. http://www-gap.dcs.st-and.ac.uk/~history/PictDisplay/Friedrichs.html

Kurt Friedrichs JOC/EFR September 2003 The URL of this page is: http://www-history.mcs.st-andrews.ac.uk/PictDisplay/Friedrichs.html

9. Kurt Otto Friedrichs, September 28, 1901—January 1, 1983 | By Cathleen Synge Mo kurt Otto friedrichs. September 28, 1901 January 1, 1983. By Cathleen Synge Morawetz. THIS MEMORIAL OF kurt Otto friedrichs is given in two parts. The first is about his life and its relation to his http://www.nap.edu/readingroom/books/biomems/kfriedrichs.html

BIOGRAPHICAL MEMOIRS National Academy of Sciences Kurt Otto Friedrichs By Cathleen Synge Morawetz THIS MEMORIAL OF KURT Otto Friedrichs is given in two parts. The first is about his life and its relation to his mathematics. The second part is about his work, which spanned a very great variety of innovative topics where the innovator was Friedrichs. PART I: LIFE Those first three papers demonstrate most of Friedrichs's lifetime in mathematicsthe first on the fundamental laws of the nature of matter, the second on applied mathematics viewed through analysis, and the third on basic theorems of wave propagation. The paper on hyperbolic partial differential equations led naturally to what turned out to be one of the best-known and most used results of mathematics of the time (1928,2). In investigating whether difference schemes for a time-varying partial differential equation like the wave or heat equation yield a good approximate solution, Courant, Friedrichs, and Lewy were led to consider the stability of the difference scheme. In a simple difference scheme every partial derivative like f/ x is replaced by a difference of the approximating function at two values of x divided by the difference of "step" in the values of x . The three authors made the remarkable discovery that the steps in time could not be chosen arbitrarily but had to be smaller than some constant times the steps in the space variable. For the wave equation that constant was the reciprocal of the speed of propagation. For other equations there may be many such speeds or one may have a different kind of propagation, but there is always a limitation of space step (

10. National Academy Of Sciences - Deceased Member friedrichs, kurt Otto. Date of Birth September 28, 1901. Elected to NAS 1959. Date of Death January 31, 1983. Biographical Memoir HTML PDF. http://www4.nationalacademies.org/nas/nasdece.nsf/(urllinks)/NAS-58MVDZ?opendocu

11. National Academy Of Sciences Friedkin, Morris E. Friedman, Herbert. Friedmann, Herbert. friedrichs, kurt Otto. Friend, Charlotte. Fromkin, Victoria A. Frost, Edwin B. Frumkin, Alexander N. http://www4.nationalacademies.org/nas/nasdece.nsf/urllinks/$$AlphaListF?OpenDocu

12. X-history My Life in Braunschweig 19121937 by Nellie friedrichs -1980. The Life of kurt Otto friedrichs by Constance Reid - 1983 Remarks about Asta friedrichs by kurt O. friedrichs in - 1981 http://www.friedrichs.us/x-history.html

FAMILY HISTORY Family Biographies and Autobiographies Sixty-Six Happy Years (Nellie Friedrichs' Story) - 1974 My Life in Braunschweig 1912-1937 by Nellie Friedrichs -1980 The Life of Kurt Otto Friedrichs by Constance Reid - 1983 Biographical Memoir of K.O.Friedrichs by C. Morawetz 1995 ... Family Histories by David Friedrichs 1978 "The Story of My Ancestors" By Kurt O. Friedrichs (1980) Introduction to Web version -MNF Preface 1 The Area of Origin 2 The early Friedrichs Family ... Full version for printing (but it is better to print each chapter seperatly) Family Memorial Services, Remembrances, Articles Memorial Service for Didi (Ella Bruell) - 1978 Remarks about Asta Friedrichs by Kurt O. Friedrichs in - 1981 Family Memorial Service for Kurt O. Friedrichs - 1983 Memorial Service at NYU for Kurt O. Friedrichs - 1983 ... Memorial Service for Sarka Friedrichs - 2001 Other Family Stories, Excerpts, Articles of Interest A Beautiful Mind- Excerpt - relating to Kurt Friedrichs - 1998 Didi's holiday diary 1893 Didi's letter to her mother 1895

13. The Mathematics Genealogy Project - Kurt Friedrichs Morris Yachter, New York University, 1952, According to our current online database, kurt friedrichs has 35 students and 376 descendants. http://www.genealogy.ams.org/html/id.phtml?id=22260

14. Untitled 1974 Aull, Charles E. Brown, Ezra Dierker, Paul F. Exoo, Geoffrey Gardner, Ben HANSON, DENIS Hare, Donovan R. Katchalski, Meir Liu, Andy C. Daniel Grifkin, Miriam E. Hayman, Walter kurt Hinkkanen, Aimo Horowitz, Joseph Housworth, Elizabeth Ann T. Curtis, Robert T. Delgado friedrichs, Olaf Doyle, Peter G. Duff, Tom http://personalwebs.oakland.edu/~grossman/Erdos1

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15. The Mathematics Genealogy Project - Index Of FRI Translate this page friedrichs, Carsten, Technische Universität Berlin, 2000. friedrichs, kurt, Georg-August-Universität Göttingen, 1925. friedrichsdorf http://www.genealogy.ams.org/html/letter.phtml?letter=FRI

16. Couple Of Thousand DELEGLISE, MARC DeLeon, Morris Jack Delgado friedrichs, Olaf Delhomme, Christian Delic, Dejan Dell Friedman, Menahem Friedman, Sy D. friedrichs, kurt O. Frieze, Alan M. Fristedt http://personalwebs.oakland.edu/~grossman/ErdosA

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17. Kurt Otto Friedrichs, September 28, 1901—January 1, 1983 | By Cathleen Synge Mo kurt Otto friedrichs September 28, 1901 — January 1, 1983 By Cathleen Synge Morawetz. THIS MEMORIAL OF kurt Otto friedrichs is given in two parts. http://books.nap.edu/html/biomems/kfriedrichs.html

BIOGRAPHICAL MEMOIRS National Academy of Sciences Kurt Otto Friedrichs By Cathleen Synge Morawetz THIS MEMORIAL OF KURT Otto Friedrichs is given in two parts. The first is about his life and its relation to his mathematics. The second part is about his work, which spanned a very great variety of innovative topics where the innovator was Friedrichs. PART I: LIFE Those first three papers demonstrate most of Friedrichs's lifetime in mathematicsthe first on the fundamental laws of the nature of matter, the second on applied mathematics viewed through analysis, and the third on basic theorems of wave propagation. The paper on hyperbolic partial differential equations led naturally to what turned out to be one of the best-known and most used results of mathematics of the time (1928,2). In investigating whether difference schemes for a time-varying partial differential equation like the wave or heat equation yield a good approximate solution, Courant, Friedrichs, and Lewy were led to consider the stability of the difference scheme. In a simple difference scheme every partial derivative like f/ x is replaced by a difference of the approximating function at two values of x divided by the difference of "step" in the values of x . The three authors made the remarkable discovery that the steps in time could not be chosen arbitrarily but had to be smaller than some constant times the steps in the space variable. For the wave equation that constant was the reciprocal of the speed of propagation. For other equations there may be many such speeds or one may have a different kind of propagation, but there is always a limitation of space step (

18. Untitled 1 2.9 friedrichs, kurt O. 1 3.0 COFREMATTA, ALVARO 1 3.1 HAUSMAN, MIRIAM 1 3.2 SHLAPENTOKH, ALEXANDRA 2 34.1 JETTER, kurt 2 34.2 ZAME, ALAN 1 34.3 CHEN, LESTER http://cpacker.org/erdos/ord-row.lis

19. Auteur - Friedrichs, Kurt Otto http://bibli.cirm.univ-mrs.fr/Auteur.htm?numrec=061963402914520

20. New Page 1 of the hypotenuse if the lengths of the hypotenuse if the lengths of the other sides are given" (friedrichs 5). 1991. friedrichs, kurt O. From Pythagoras to Einstein http://www.sienahts.edu/~kabdo/triples.htm

Home About Me Mathematics Pythagorean Triples By: Kelly Abdo The theorem that is credited to Pythagoras concerns itself with the sides of a right triangle. The three sides of the triangle consist of two legs adjacent to the right angle, and of the hypotenuse opposite of that angle. "The Pythagorean theorem gives a relationship between the lengths of the three sides; it enables one to compute the length of the hypotenuse if the lengths of the hypotenuse if the lengths of the other sides are given" (Friedrichs 5). Morris “Three integers a, b, and c that satisfy a + b = c are called Pythagorean Triples. a = n – m , b = 2nm, c = n + m These three numbers a, b, and c, always form a Pythagorean Triple” (Bogomolny 1). The proof for this is fairly simple to follow: “(n – m = n m + m m = n m + m = (n + m ” (Bogomolny 2). For example: Let n = 4, and let m = 2 a = 4 b = 2(4*2) = 16 c = 4 Euclid and Diaphantus, to obtain Pythagorean triples with special properties, used this formula. Many people believe that the Pythagoreans, around the year 500 B.C.E, discovered the Pythagorean triples. However, an excavated clay tablet was found in 1945 to prove otherwise. This “Babylonian clay tablet, called the Plimpton 322, (pictured below) was deciphered by Neugebauer and Sachs” (Burton 68).

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