Jump to content

Masatake Kuranishi: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
added ref to 1962 ICM
added Lectures on involutive systems ...
Line 13: Line 13:
{{quotation|In a series of deep papers published in 1982 [Kur I,<ref>{{cite journal|author=Kuranishi, M.|title=Strongly pseudoconvex CR structures over small balls: Part I. An a priori estimate|journal=Annals of Mathematics|volume=115|year=1982|pages=451-500|doi=10.2307/2007010}}</ref> II,<ref>{{cite journal|author=Kuranishi, M.|year=1982|title=Strongly pseudoconvex CR structures over small balls: Part II. A regularity theorem|journal=Annals of Mathematics|volume=116|pages=1-64|doi=10.2307/2007047}}</ref> III<ref>{{cite journal|author=Kuranishi, M.|year=1982|title=Strongly pseudoconvex CR structures over small balls: Part III. An embedding theorem|journal=Annals of Mathematics|volume=116|pages=249-330|doi=10.2307/2007063}}</ref>], Kuranishi developed the theory of harmonic integrals on strongly pseudoconvex CR structures over small balls along the line developed by D. C. Spencer, C. B. Morrey, J. J. Kohn and Nirenberg. He considered a strongly pseudoconvex CR structure on a manifold of real dimension 2''n''–1. In [Kur I], he established the a priori estimate for the Neumann boundary problem on the complex associated with the structure, in the case the structure is induced by an embedding in C<sup>n</sup> and restricted to a small ball of special type, provided 1 ≤ ''q'' ≤ ''n'' – 3, where ''q'' is the degree of differential forms. In [Kur II], he developed the regularity theorem of solutions of the Neumann boundary problem based on the a priori estimate of [Kur I]. As a significant application of his deep theory, he proved in [Kur III] that, when ''n'' ≥ 5, the structure is realized on a neighborhood of a reference point by an embedding in C<sup>n</sup>.<ref>{{cite book|editor=Bedford, Eric|title=Several Complex Variables and Complex Geometry, Part 3|chapter=Obstructions to Embedding of Real (2''n'' – 1)-Dimensional Compact CR Manifolds in C<sup>n+1</sup> by Hing-Sun Luk and Stephen S.-T. Yau|page=261|url=http://books.google.com/books?id=6m_6ZHlkBk8C&pg=PA261}}</ref>}}
{{quotation|In a series of deep papers published in 1982 [Kur I,<ref>{{cite journal|author=Kuranishi, M.|title=Strongly pseudoconvex CR structures over small balls: Part I. An a priori estimate|journal=Annals of Mathematics|volume=115|year=1982|pages=451-500|doi=10.2307/2007010}}</ref> II,<ref>{{cite journal|author=Kuranishi, M.|year=1982|title=Strongly pseudoconvex CR structures over small balls: Part II. A regularity theorem|journal=Annals of Mathematics|volume=116|pages=1-64|doi=10.2307/2007047}}</ref> III<ref>{{cite journal|author=Kuranishi, M.|year=1982|title=Strongly pseudoconvex CR structures over small balls: Part III. An embedding theorem|journal=Annals of Mathematics|volume=116|pages=249-330|doi=10.2307/2007063}}</ref>], Kuranishi developed the theory of harmonic integrals on strongly pseudoconvex CR structures over small balls along the line developed by D. C. Spencer, C. B. Morrey, J. J. Kohn and Nirenberg. He considered a strongly pseudoconvex CR structure on a manifold of real dimension 2''n''–1. In [Kur I], he established the a priori estimate for the Neumann boundary problem on the complex associated with the structure, in the case the structure is induced by an embedding in C<sup>n</sup> and restricted to a small ball of special type, provided 1 ≤ ''q'' ≤ ''n'' – 3, where ''q'' is the degree of differential forms. In [Kur II], he developed the regularity theorem of solutions of the Neumann boundary problem based on the a priori estimate of [Kur I]. As a significant application of his deep theory, he proved in [Kur III] that, when ''n'' ≥ 5, the structure is realized on a neighborhood of a reference point by an embedding in C<sup>n</sup>.<ref>{{cite book|editor=Bedford, Eric|title=Several Complex Variables and Complex Geometry, Part 3|chapter=Obstructions to Embedding of Real (2''n'' – 1)-Dimensional Compact CR Manifolds in C<sup>n+1</sup> by Hing-Sun Luk and Stephen S.-T. Yau|page=261|url=http://books.google.com/books?id=6m_6ZHlkBk8C&pg=PA261}}</ref>}}


Thus, by Kuranishi's work, in real dimension 9 and higher, local embedding of abstract CR structures is true and is also true in real dimension 7 by the work of Akahori.<ref>{{cite journal|author=Akahori, Takao|title= A New approach to the Local Embedding theorem of CR Structures of <math>n\geq 4</math> (the local solvability of the operator <math>\overline{\partial_b}</math> in the abstract sense)|journal=Memoirs of the American Math. Society|volume=67|issue=366|year=1987}}</ref> A simplified presentation of Kuranishi's proof is due to Webster.<ref>{{cite journal|author=Webster, Sidney, M.|title= On the Proof of Kuranishi's Embedding Theorem|journal=Annales Institut Henri Poincaré(C) Analyse Nonlineare|volume=6|issue=3|year=1989|pages=183–207|url=https://eudml.org/doc/78174}}</ref> For ''n'' = 2, Nirenberg published a counterexample. The local embedding problem remains open in real dimension 5.
Thus, by Kuranishi's work, in real dimension 9 and higher, local embedding of abstract CR structures is true and is also true in real dimension 7 by the work of Akahori.<ref>{{cite journal|author=Akahori, Takao|title= A New approach to the Local Embedding theorem of CR Structures of <math>n\geq 4</math> (the local solvability of the operator <math>\overline{\partial_b}</math> in the abstract sense)|journal=Memoirs of the American Math. Society|volume=67|issue=366|year=1987}}</ref> A simplified presentation of Kuranishi's proof is due to Webster.<ref>{{cite journal|author=Webster, Sidney, M.|title= On the Proof of Kuranishi's Embedding Theorem|journal=Annales Institut Henri Poincaré(C) Analyse Nonlineare|volume=6|issue=3|year=1989|pages=183–207|url=https://eudml.org/doc/78174}}</ref> For ''n'' = 2 (''i.e.'' real dimension 3), Nirenberg published a counterexample. The local embedding problem remains open in real dimension 5.


==Selected publications==
==Selected publications==
*[[Heisuke Hironaka]] (ed.): [http://www.worldscientific.com/worldscibooks/10.1142/8801 ''Masatake Kuranishi - Selected Papers''], Springer 2010
*[[Heisuke Hironaka]] (ed.): [http://www.worldscientific.com/worldscibooks/10.1142/8801 ''Masatake Kuranishi - Selected Papers''], Springer 2010
*Kuranishi: ''Deformations of compact complex manifolds'', Montreal, Presses de l'Universite de Montreal, 1971.
*Kuranishi: ''Deformations of compact complex manifolds'', Montreal, Presses de l'Universite de Montreal, 1971, 99 pages.
*Kuranishi: ''Lectures on involutive systems of partial differential equations'', Sociedade de matemática de São Paulo, 1967, 75 pages.


==See also==
==See also==

Revision as of 17:16, 14 November 2015

Masatake Kuranishi (倉西 正武 Kuranishi Masatake, born 19 July 1924, Tokyo) is a Japanese mathematician who works on several complex variables, partial differential equations, and differential geometry.

Education and career

Kuranishi received in 1952 his Ph.D. from Nagoya University. He became there in 1951 a lecturer, in 1952 an associate professor, and in 1958 a full professor.[1] From 1955 to 1956 he was a visiting scholar at the Institute for Advanced Study in Princeton, New Jersey.[2] From 1956 to 1961 he was a visiting professor at the University of Chicago, Massachusetts Institute of Technology and Princeton University. He became in the summer of 1961 a professor at Columbia University.[1]

Kuranishi was an invited speaker at the International Congress of Mathematicians in 1962 at Stockholm with talk On deformations of compact complex structures[3] and in 1970 at Nice with talk Convexity conditions related to 1/2 estimate on elliptic complexes. He was a Guggenheim Fellow for the academic year 1975–1976.[4] In 2000 he received the Stefan Bergman Prize.[1] In 2014 he received the Geometry Prize of the Mathematical Society of Japan.

Research

Kuranishi and Élie Cartan established the eponymous Cartan-Kuranishi Theorem on the continuation of exterior differential forms.[5] In 1962, based upon the work of Kodaira Kunihiko and Donald Spencer, Kuranishi constructed locally complete deformations of compact complex manifolds.[6]

In 1982 he made important progress in the embedding problem for CR-structures (Cauchy-Riemann structures).

In a series of deep papers published in 1982 [Kur I,[7] II,[8] III[9]], Kuranishi developed the theory of harmonic integrals on strongly pseudoconvex CR structures over small balls along the line developed by D. C. Spencer, C. B. Morrey, J. J. Kohn and Nirenberg. He considered a strongly pseudoconvex CR structure on a manifold of real dimension 2n–1. In [Kur I], he established the a priori estimate for the Neumann boundary problem on the complex associated with the structure, in the case the structure is induced by an embedding in Cn and restricted to a small ball of special type, provided 1 ≤ q ≤ n – 3, where q is the degree of differential forms. In [Kur II], he developed the regularity theorem of solutions of the Neumann boundary problem based on the a priori estimate of [Kur I]. As a significant application of his deep theory, he proved in [Kur III] that, when n ≥ 5, the structure is realized on a neighborhood of a reference point by an embedding in Cn.[10]

Thus, by Kuranishi's work, in real dimension 9 and higher, local embedding of abstract CR structures is true and is also true in real dimension 7 by the work of Akahori.[11] A simplified presentation of Kuranishi's proof is due to Webster.[12] For n = 2 (i.e. real dimension 3), Nirenberg published a counterexample. The local embedding problem remains open in real dimension 5.

Selected publications

  • Heisuke Hironaka (ed.): Masatake Kuranishi - Selected Papers, Springer 2010
  • Kuranishi: Deformations of compact complex manifolds, Montreal, Presses de l'Universite de Montreal, 1971, 99 pages.
  • Kuranishi: Lectures on involutive systems of partial differential equations, Sociedade de matemática de São Paulo, 1967, 75 pages.

See also

References

  1. ^ a b c Bergman Prize for Kuranishi, Notices AMS
  2. ^ Kuranishi, Masatake | Institute for Advanced Study
  3. ^ Kuranishi, M. (1963). "On deformations of compact complex structures" (PDF). Proc. Intern. Congr. Math., Stockholm: 357–359.
  4. ^ John Simon Guggenheim Foundation | Masatake Kuranishi
  5. ^ Kuranishi, M. (1957). "On E. Cartan's prolongation theorem of exterior differential systems". Am. J. Math. 79: 1–47. doi:10.2307/2372381.
  6. ^ Kuranishi, M. (1962). "On the locally complete families of complex analytic structures". Annals of Math. 75: 536–577. doi:10.2307/1970211.
  7. ^ Kuranishi, M. (1982). "Strongly pseudoconvex CR structures over small balls: Part I. An a priori estimate". Annals of Mathematics. 115: 451–500. doi:10.2307/2007010.
  8. ^ Kuranishi, M. (1982). "Strongly pseudoconvex CR structures over small balls: Part II. A regularity theorem". Annals of Mathematics. 116: 1–64. doi:10.2307/2007047.
  9. ^ Kuranishi, M. (1982). "Strongly pseudoconvex CR structures over small balls: Part III. An embedding theorem". Annals of Mathematics. 116: 249–330. doi:10.2307/2007063.
  10. ^ Bedford, Eric (ed.). "Obstructions to Embedding of Real (2n – 1)-Dimensional Compact CR Manifolds in Cn+1 by Hing-Sun Luk and Stephen S.-T. Yau". Several Complex Variables and Complex Geometry, Part 3. p. 261.
  11. ^ Akahori, Takao (1987). "A New approach to the Local Embedding theorem of CR Structures of (the local solvability of the operator in the abstract sense)". Memoirs of the American Math. Society. 67 (366).
  12. ^ Webster, Sidney, M. (1989). "On the Proof of Kuranishi's Embedding Theorem". Annales Institut Henri Poincaré(C) Analyse Nonlineare. 6 (3): 183–207.{{cite journal}}: CS1 maint: multiple names: authors list (link)

Template:Persondata

Retrieved from "https://en.wikipedia.org/w/index.php?title=Masatake_Kuranishi&oldid=690633311"