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The Jacobi--Trudi identity associates a symmetric function to any integersequence. Let $\Gamma_{(t|X)}$ be the vertex operator defined by$\Gamma_{(t|X)} s_\alpha =\sum_{n \in \mathbb{Z}} s_{(n,\alpha)} [X] t^n$. Weprovide a combinatorial proof for the identity $\Gamma_{(t|X)} s_\alpha =\sigma[tX] s_{\alpha}\big[x-1/t\big] $ due to Thibon et al. We include anoverview of all the combinatorial ideas behind this beautiful identity,including a combinatorial description for the expansion of $s_{(n,\alpha)} [X]$ in the Schur basis, for any integer value of $n$.

A comment of the combinatorics of the vertex operator $\Gamma_{(t|X)}$