Submission: 2014, Nov 27
A ``rational'' version of the strengthened form of the Commuting Derivation Conjecture, in which the assumption of commutativity is dropped, is proved. A systematic method of constructing in any dimension greater than 3 the examples answering in the negative a question by M. El Kahoui is developed.
2010 Mathematics Subject Classification: 20Gxx, 13N15, 14R10
Keywords and Phrases: rational coordinate, unipotent algebraic group, locally nilpotent derivation
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