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Some $K$-theoretic properties of the kernel of a locally nilpotent derivation on $k[X_1, \dots , X_4]$

Some $K$-theoretic properties of the kernel of a locally nilpotent derivation on $k[X_1, \dots , X_4]$

Let k be an algebraically closed field of characteristic zero, D a locally nilpotent derivation on the polynomial ring k[X 1 , X 2 , X 3 , X 4 ] and A the kernel of D. A question of M. Miyanishi asks whether projective modules over A are necessarily …