#### Vol. 12, No. 2, 2018

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Proper $G_a$-actions on $\mathbb{C}^4$ preserving a coordinate

### Shulim Kaliman

Vol. 12 (2018), No. 2, 227–258
##### Abstract

We prove that the actions mentioned in the title are translations. We show also that for certain ${G}_{a}$-actions on affine fourfolds the categorical quotient of the action is automatically an affine algebraic variety and describe the geometric structure of such quotients.

 Dedicated to my teachers, Vladimir Yakovlevich Lin and Evgeniy Alekseevich Gorin

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proper $G_a$-action on affine 4-space