Tohoku Mathematical Journal
2018
September
SECOND SERIES VOL. 70, NO. 3

Tohoku Math. J.
70 (2018), 391-400

Title THE ISOMETRY GROUPS OF COMPACT MANIFOLDS WITH ALMOST NEGATIVE RICCI CURVATURE

Author Atsushi Katsuda and Takeshi Kobayashi

(Received January 21, 2016, revised April 27, 2016)
Abstract. We estimate the order of isometry groups of compact Riemannian manifolds which have negative Ricci curvature except for small portions, in terms of geometric quantities.

Mathematics Subject Classification. Primary 53; Secondary 58.
Key words and phrases. Isometry group, comparison theorem.

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