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 $GL_n$-decomposition of the Schur complex $S_r%\wedge^2 \varphi)$ Bull. Korean Math. Soc. 2003 Vol. 40, No. 1, 29-51 Published online March 1, 2003 Eun J. Choi, Young H. Kim, Hyoung J. Ko, and Seoung J. Won Yonsei University, Yonsei University, Yonsei University, Yonsei University Abstract : In this paper we construct a natural filtration associated to the plethysm $S_r(\wedge^2 \varphi)$ over arbitrary commutative ring $R$. Let $\varphi :~G\longrightarrow F$ be a morphism of finite free $R-$modules. We construct the natural filtration of $S_r (\wedge^2 \varphi )$ as a $GL(F)\times GL(G)-$ complex such that its associated graded complex is $\sum_{\lambda \in \Omega_r ^-} L_{2\lambda} \varphi$, where $\Omega_r^-$ is a set of partitions such that $|\lambda|= r$ and $2\lambda$ is a partition of which $i$-th term is $2\lambda_i$. Specializing our result, we obtain the filtrations of $S_r (\wedge^2 F)$ and $D_r (D_2 G)$. Keywords : natural filtration, plethysm, $S_r (\wedge^2\varphi), S_r (\wedge^2 F), D_r (D_2 G)$ MSC numbers : 13D25, 20G05, 05E10 Downloads: Full-text PDF