Abstract
Isomorphisms that preserve a certain geometric structure are easily destroyed by an arbitrary small deformation of the structure, but restoring them requires a definite amount of change. Such an intuitive understanding has actually been established as precise theorems, via Lie groups, Riemannian geometry, and several complex variables. The aim of this paper is to present a concise but comprehensive exposition.
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Research of the second named author has been supported in part by Grant 2011-0030044 (SRC-GAIA) of National Research Foundation of South Korea.
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Greene, R.E., Kim, KT. Semicontinuity of Isometry Groups and Isomorphism Groups: a Survey. Acta Math Vietnam 45, 161–169 (2020). https://doi.org/10.1007/s40306-019-00340-7
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DOI: https://doi.org/10.1007/s40306-019-00340-7