Exotic Ga-quotients of SL${}_2\times {\mathbb{A}}^1$

Abstract

Every deformed Koras-Russell threefold of the first kind $Y=\left\{x^{n}z=y^m-t^r+xh(x,y,t)\right\}$ in ${\mathbb{A}}^4$ is the algebraic quotient of proper Zariski locally trivial ${\mathbb{G}}_a$-action on ${\mathrm{SL}}_2\times {\mathbb{A}}^1$.

References in corpus (1)

• A1 contractibility of affine modifications