Abstract
If k is a field of characteristic zero, c ∈ k∖{0}, s, t ≥ 1, and r ≥ 0 are integers, then it is shown that the k-derivation y r ∂ x + (y s x t + c)∂ y of the polynomial algebra k[x, y] is simple.
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ACKNOWLEDGMENT
I wish to express my deep gratitude to my thesis supervisor, Prof. Alok K. Maloo for his continuous help and guidance.
Notes
Communicated by M. Bresar.