The automorphism theorem and additive group actions on the affine plane

preprint2016arXivOpen access

Abstract

Due to Rentschler, Miyanishi and Kojima, the invariant ring for a Ga{\bf G}_a-action on the affine plane over an arbitrary field is generated by one coordinate. In this note, we give a new short proof for this result using the automorphism theorem of Jung and van der Kulk.

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