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- W2949454756 abstract "In this paper, we study the vector invariants, ${bf{F}}[m V_2]^{C_p}$, of the 2-dimensional indecomposable representation $V_2$ of the cylic group, $C_p$, of order $p$ over a field ${bf{F}}$ of characteristic $p$. This ring of invariants was first studied by David Richman cite{richman} who showed that this ring required a generator of degree $m(p-1)$, thus demonstrating that the result of Noether in characteristic 0 (that the ring of invariants of a finite group is always generated in degrees less than or equal to the order of the group) does not extend to the modular case. He also conjectured that a certain set of invariants was a generating set with a proof in the case $p=2$. This conjecture was proved by Campbell and Hughes in cite{campbell-hughes}. Later, Shank and Wehlau in cite{cmipg} determined which elements in Richman's generating set were redundant thereby producing a minimal generating set. We give a new proof of the result of Campbell and Hughes, Shank and Wehlau giving a minimal algebra generating set for the ring of invariants ${bf{F}}[m V_2]^{C_p}$. In fact, our proof does much more. We show that our minimal generating set is also a SAGBI basis for ${bf{F}}[m V_2]^{C_p}$. Further, our techniques also serve to give an explicit decomposition of ${bf{F}}[m V_2]$ into a direct sum of indecomposable $C_p$-modules. Finally, noting that our representation of $C_p$ on $V_2$ is as the $p$-Sylow subgroup of $SL_2({bf F}_p)$, we are able to determine a generating set for the ring of invariants of ${bf{F}}[m V_2]^{SL_2({bf F}_p)}$." @default.
- W2949454756 created "2019-06-27" @default.
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- W2949454756 date "2009-01-19" @default.
- W2949454756 modified "2023-09-27" @default.
- W2949454756 title "Vector invariants for the two dimensional modular representation of a cyclic group of prime order" @default.
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