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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Self-intersection class for singularities and its application to fold maps
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by Toru Ohmoto, Osamu Saeki and Kazuhiro Sakuma PDF
Trans. Amer. Math. Soc. 355 (2003), 3825-3838 Request permission

Abstract:

Let $f :M \to N$ be a generic smooth map with corank one singularities between manifolds, and let $S(f)$ be the singular point set of $f$. We define the self-intersection class $I(S(f)) \in H^*(M; \mathbf {Z})$ of $S(f)$ using an incident class introduced by Rimányi but with twisted coefficients, and give a formula for $I(S(f))$ in terms of characteristic classes of the manifolds. We then apply the formula to the existence problem of fold maps.
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Additional Information
  • Toru Ohmoto
  • Affiliation: Department of Mathematics and Computer Science, Faculty of Science, Kagoshima University, Koorimoto, Kagoshima 890-0065, Japan
  • Email: ohmoto@sci.kagoshima-u.ac.jp
  • Osamu Saeki
  • Affiliation: Faculty of Mathematics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
  • Email: saeki@math.kyushu-u.ac.jp
  • Kazuhiro Sakuma
  • Affiliation: Department of Mathematics and Physics, Faculty of Science and Technology, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
  • Email: sakuma@math.kindai.ac.jp
  • Received by editor(s): September 12, 2002
  • Received by editor(s) in revised form: March 24, 2003
  • Published electronically: May 29, 2003
  • Additional Notes: The first author has been partially supported by Grant-in-Aid for Scientific Research (No. 12740046), the Ministry of Education, Science and Culture, Japan. The second and the third authors have been partially supported by Grant-in-Aid for Scientific Research (No. 13640076), the Ministry of Education, Science and Culture, Japan. The third author has also been partially supported by Grant for Encouragement of Young Researchers, Kinki Univ. (G008).

  • Dedicated: Dedicated to Professor Takuo Fukuda on the occasion of his 60th birthday
  • © Copyright 2003 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 355 (2003), 3825-3838
  • MSC (2000): Primary 57R45; Secondary 57R42
  • DOI: https://doi.org/10.1090/S0002-9947-03-03345-2
  • MathSciNet review: 1990176