Abstract
The notion of deformations of germs of k-analytic mappings generalizes the one of deformations of germs of k-analytic spaces. Using algebraic terms, we prove:
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1.
The morphism f: A→B of analytic algebras is rigid, iff it is infinitesimally rigid. Moreover, this is equivalent to ExA (B,B)=0. This theorem generalizes a result of SCHUSTER [11].
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2.
Let A be a regular analytic algebra. Then f is rigid iff there exists a rigid analytic algebra Bo such that f is equivalent to the canonic injection A→A⊗Bo.
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3.
If f is “almost everywhere” rigid or smooth, then the injection Ext lB (ΩB|A, Bn)→ExA(B, Bn) is an isomorphism.
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Kramm, B. Über Deformationen von analytischen Abbildungskeimen. Manuscripta Math 10, 163–189 (1973). https://doi.org/10.1007/BF01475040
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DOI: https://doi.org/10.1007/BF01475040