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Non-commutative amoebas

Published inBulletin of the London Mathematical Society, vol. 54, no. 2, p. 335-368
Publication date2022-04
First online date2022-03-17
Abstract

The group of isometries of the hyperbolic space ℍ3 is the 3-dimensional group PSL2(ℂ), which is one of the simplest non-commutative complex Lie groups. Its quotient by the subgroup SO(3) ⊂ PSL2(ℂ) naturally maps it back to ℍ3. Each fiber of this map is diffeomorphic to the real projective 3-space ℝℙ3. The resulting map PSL2(ℂ) → ℍ3 can be viewed as the simplest non-commutative counterpart of the map Log ∶ (ℂ×)𝑛 → ℝ𝑛 from the commutative complex Lie group (ℂ×)𝑛 with the Lagrangian torus fibers that can be considered as a Liouville–Arnold type integrable system. Gelfand, Kapranov and Zelevinsky have introduced amoebas of algebraic varieties 𝑉 ⊂ (ℂ×)𝑛 as images Log(𝑉) ⊂ ℝ𝑛. We define the amoeba of an algebraic subvariety of PSL2(ℂ) as its image inℍ3. The paper surveys basic properties of the resulting hyperbolic amoebas and compares them against the commutative amoebas ℝ𝑛.

Citation (ISO format)
MIKHALKIN, Grigory, SHKOLNIKOV, Mikhail. Non-commutative amoebas. In: Bulletin of the London Mathematical Society, 2022, vol. 54, n° 2, p. 335–368. doi: 10.1112/blms.12622
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ISSN of the journal0024-6093
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