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\subsection{定义} | ||
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\begin{itemize} | ||
\item[Young 图] 形状为 \(\lambda=(\lambda_1,\dots,\lambda_k)\) (\(\lambda_1\geq \dots\geq \lambda_k\)) 的 Young 图为一个左对齐的, 由若干方格构成的图, 第 \(i\) 行有 \(\lambda_i\) 个方格. | ||
\item[Young 表] 在形状为 \(\lambda\) 的 Young 图的方块中填入长度为 \(\sum_k \lambda_k\) 的排列, 使得每一行(从左到右)每一列(从上到下)都是单调递增的, 得到的图形即为形状为 \(\lambda\) 的 Young 表. | ||
\end{itemize} | ||
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\subsection{勾长公式} | ||
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对形状为 \(\lambda\) 的 Young 表, 位置为 \((i,j)\) 的方格的勾长定义为 | ||
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\[ | ||
h_{\lambda}(i,j):=\left|\left\{(I,J):i\leq I, j\leq J,(i=I \lor j=J)\right\}\right| | ||
\] | ||
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则形状为 \(\lambda\) 的 Young 表总数为 | ||
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\[ | ||
\frac{n!}{\prod_{i,j} h_{\lambda}(i,j)} | ||
\] |
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