DLMF:26.14.E1

MaRDI QIDQ8645

• Label: DLMF:26.14.E1

Digital Library of Mathematical Functions ID 26.14.E1

${\displaystyle{\displaystyle\mathop{\mathrm{inv}}(\sigma)=\sum_{\begin{subarray}{c}1\leq j<k\leq n\\ \sigma(j)>\sigma(k)\end{subarray}}1.}}$

Symbols List

• ${\displaystyle{\displaystyle j}}$: nonnegative integer
• ${\displaystyle{\displaystyle k}}$: nonnegative integer
• ${\displaystyle{\displaystyle n}}$: nonnegative integer
• ${\displaystyle{\displaystyle\sigma}}$: permutation
 

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