Abstract
Let $A$ be a $\q$-domain, $K=\text{frac\,}(A)$, $B=A^{[n]}$ and $D\in \text{LND}_A(B)$. Assume rank $D=\text{rank\,}D_K=r$, where $D_K$ is the extension of $D$ to $K^{[n]}$. Then we show that
\hskip5pt(i) If $D_K$ is rigid, then $D$ is rigid.
\hskip2.5pt(ii) Assume $n=3$, $r=2$ and $B=A[X,Y,Z]$ with $DX=0$. Then $D$ is triangulable over $A$ if and only if $D$ is triangulable over $A[X]$. In case $A$ is a field, this result is due to Daigle.
Citation
Manoj K. Keshari. Swapnil A. Lokhande. "A note on rigidity and triangulability of a derivation." J. Commut. Algebra 6 (1) 95 - 100, SPRING 2014. https://doi.org/10.1216/JCA-2014-6-1-95
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