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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-30 and was most recently seen on 2026-06-30.
In algebraic geometry, the Koras–Russell cubic threefolds are smooth affine complex threefolds diffeomorphic to studied by Koras & Russell (1997). They have a hyperbolic action of a one-dimensional torus with a unique fixed point, such that the quotients of the threefold and the tangent space of the fixed point by this action are isomorphic. They were discovered in the process of proving the Linearization Conjecture in dimension 3. A linear action of on the affine space is one of the form , where and . The Linearization Conjecture in dimension says that every algebraic action of on the complex affine space is linear in some algebraic coordinates on . M. Koras and P. Russell made a key step towards the solution in dimension 3, providing a list of threefolds and proving that the Linearization Conjecture for holds if all those threefolds are exotic affine 3-spaces, that is, none of them is isomorphic to . This was later shown by Kaliman and Makar-Limanov using the ML-invariant of an affine variety, which had been invented exactly for this purpose.
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