Philip Hartman Explained

Philip Hartman
Birth Date:	1915 5, df=yes
Birth Place:	Baltimore^[1]
Nationality:	American
Fields:	Mathematics
Workplaces:	Johns Hopkins University Queens College
Alma Mater:	Johns Hopkins University^[2]
Doctoral Advisor:	Aurel Wintner
Awards:	Guggenheim Fellowship (Mathematics, 1950),^[3] Honorary Member of the AMS^[4]
Known For:	Hartman–Grobman theorem

Philip Hartman (May 16, 1915  - August 28, 2015) was an American mathematician at Johns Hopkins University working on differential equations who introduced the Hartman–Grobman theorem. He served as Chairman of the Mathematics Department at Johns Hopkins for several years. He has an Erdös number of 2.^[5]

His book gives a necessary and sufficient condition for solutions of ordinary initial value problems to be unique and to depend on a class C¹ manner on the initial conditions for solutions.

He died in August 2015 at the age of 100.^[6]

Notes and References

1. [James McKeen Cattell]
2. https://jscholarship.library.jhu.edu/bitstream/handle/1774.2/36753/commencement1938.pdf?sequence=1 Conferring of Degrees, The Johns Hopkins University, Baltimore, June 14 1938
3. http://www.gf.org/fellows/all-fellows/philip-hartman/ Philip Hartman, John Simon Guggenheim Memorial Foundation
4. https://www.ams.org/notices/200011/from.pdf Honorary Members of the AMS
5. Web site: Compute your Erdös number - The Erdös Number Project- Oakland University. oakland.edu. en. 2017-08-15.
6. 1510.03779. Newhouse. Sheldon E.. On a differentiable linearization theorem of Philip Hartman. math.DS. 2015.