### Walter Noll (1925-2017)

July 6, 2017

Science teachers tend to simplify things for their students, and this often includes an historical summary of the topic area that shows the logical steps to the science that we have today. Most of this is pure hagiography, with the dead-end theories and other missteps edited away. Often, the stated origin of a scientific principle is at a convenient, modern milepost. That's why I always enjoy probing the ancient texts for clues to where ideas might have originated.

Mathematician and American Mathematical Society fellow, Walter Noll (1925-2017), developed mathematical tools in the physics areas of thermodynamics and classical mechanics. He was, therefore, qualified to add his perspective to an article by Frank Wilczek about the law of motion, F = ma, equation published in the October, 2004, issue of Physics Today.[1]

 Mathematician, Walter Noll (1925-2017).This photo was taken at the XXXII International Congress of The Italian Society of Historians of Physics and Astronomy, Physics, Astronomy and Engineering, Rome, Italy, September 27, 2012.(Wikimedia Commons image by "Emanzamp.")

While I used the F = ma equation often in my work, I still recall the many times that I was forced to use it as a student (pun intended). Its application was not intuitive. This point was amplified by one of my professors, who told us that all physics (he meant classical mechanics) was F = ma. Our problem was to decide what F, m, and a meant under the specific conditions of our problem. This was not very encouraging for a young physicist.

Noll had a similar opinion of F = ma, which is an equation that's applied to not only dynamics, but to statics. In statics, the acceleration a is obviously zero, but it's explained-away by the idea that the sum of the forces is zero. This is mathematically correct, but does this gloss over some important physics?[2]

Noll points out that this idea of balanced forces preceded Newton's F = ma, and it originated with Archimedes. As Noll summarizes,
"In non-classical physics, the term "force" is used when such things as gravitational force, electromagnetic force, weak force, and strong force are considered. The term cannot be given an interpretation similar to the one used in classical physics..."[2]

 Flashback to college freshman physics.Forces on a body on an inclined plane.If the block is held by friction, there's no acceleration, so where's the force?(Created using Inkscape.)

This was not the only time in his career that Noll, who died at age 92 on June 6, 2017,[3] waxed philosophical. Born in Berlin, Germany, on January 7, 1925, to Franz and Martha Noll, Noll had his early education in a suburb of Berlin, excelling in mathematics and physics.[3-4] His studies were interrupted by World War II, when he was drafted into the German army in 1943.[3] Many of his classmates were killed in the war, but Noll sustained a non-combat injury and was in a hospital for many months. Due to a fortunate administrative error, he remained several months at home before returning to the army.[3]

Noll studied mathematics after the war at the Technical University of Berlin, also taking classes at the Humboldt University of Berlin and the Free University of Berlin.[3-4] He was a foreign student at the University of Paris from 1949-1950, attaining the degree of Licencié ès Sciences, then going on to get a Diplom-Ingenieur (in Mathematics) at the Technical University of Berlin.[4] He remained at the Technical University as an instructor in its Institute for Engineering Mechanics for four years, taking leave in 1953 to obtain his Ph.D. in Applied Mathematics from Indiana University (Bloomington, Indiana).[4]

Noll his Ph.D. at Indiana University in 1954 for a thesis entitled, "On the Continuity of the Solid and Fluid States." Clifford Truesdell was his thesis advisor, and he was Truesdell's first doctoral student.[4] His thesis was published in the Journal of Rational Mechanics and Analysis and also in one of Truesdell's books.[3] His thesis was completed in just a year, after which time Noll returned to Germany to marry his first wife, Helga.[3]

 Clifford Truesdell (1919-2000).Truesdell was also an historian of science and mathematics, editing, or co-editing, six volumes of the collected works of Leonhard Euler.(Copyright Mathematisches Forschungsinstitut Oberwolfach, Creative Commons Licensed, via Wikimedia Commons. Modified for artistic effect.)

Noll's first position was at the University of Southern California, where he stayed a year after emigrating to the United States in the fall of 1955, after which he joined the faculty at Carnegie Institute of Technology (now, Carnegie-Mellon University) in 1956.[4] Although Noll remained at Carnegie Mellon from 1956 through the rest of his life, he undertook visiting professorships at Johns Hopkins University, the University of Karlsruhe, the Israel Institute of Technology, the École Polytechnique in Nancy, the University of Pisa, the University of Pavia, and Oxford University.[3-4]

Brian Seguin, one of Noll's doctoral students, now an assistant professor at Loyola University Chicago, said that Noll was most proud of his book, "Finite-Dimensional Spaces."[3] Noll is famous for the Coleman-Noll procedure that places restrictions on the kind of materials that can occur in nature in conformance with the second law of thermodynamics (the entropy law).[3]

Because of his post-war experiences with hunger, Noll was a supporter of CARE and similar organizations.[3] As most professionals, he instilled in his children the importance of education. In a 2002 letter about mathematics education to the Pittsburgh Post-Gazette, Noll wrote that "memorization is deadly, while conceptual understanding and problem-solving ability are essential."[3]

Noll survived his first wife, Helga, who died in 1976, and he married Mary Strauss-Noll, a Penn State University English professor, three years later.[3] When Mary died in 1999, Noll found his third wife, Marilyn Smith Noll, online, and they married in 2000.[3] Even at his advanced age, he enjoyed travel, snorkeling in the Great Barrier Reef at age 85.[3]

Noll retired from Carnegie Mellon in 1993, but he still taught, wrote and lectured.[3] He was a founding member of the Society for Natural Philosophy, and a fellow of the American Mathematical Society.[3] As his health was failing, he told his wife that he was still always thinking about mathematics.[3] Fortunately, there's a trove of his articles on the Internet, a consequence of his distaste for gate-keepers.[5]

Noll wrote several short articles that are more philosophical than mathematical, a few of which are listed below.
• The Future of Scientific Publication[5] - In this 2008 publication, Noll proposes that every scientist have his own website on which to publish his papers. This process would start with publication of his Ph.D. thesis, and it would enable a better dissemination of research than traditional journals. Noll recalls his suspicion that publication of one of his works was blocked at a particular publisher by a competing mathematician. He further remarks that his book, when published, was priced at \$350, but he published it on his website at no charge.

• The Role of the Professor[6] - In this 1997 article, Noll states that the primary objective of a professor should be neither teaching nor research. Instead, he should "profess;" that is, spend most of his time telling the world how wonderful his subject area is. Noll writes that high school mathematics education is in a sad state because too few of its teachers have such passion.

• On the Past and Future of Natural Philosophy[7] - In this 2005 article, Noll writes how mathematics and physics were combined in the 17th and 18th century, but now they are separate specialties.

• What is Mathematics all about[8] - In this 2006 paper, Noll writes that memorization should be only a minor part of mathematics education. Presciently, he observes, "If all you can do is to solve a problem according to some recipe, you will soon lose your job, because you can be replaced by a computer program."

• Mathematics should not be boring[9] - The main point of this 2003 paper is that arithmetic and "being good with numbers" is different from mathematics.

### References:

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