A generalized truncated logarithm

We introduce a generalization $G^{(\alpha )}(X)$ of the truncated logarithm ${\mathcal{L}}_1(X)={\sum }_{k=1}^{p-1}{X}^k\mathrm{/}k$ in characteristic $p$, which depends on a parameter $\alpha$. The main motivation of this study is $G^{(\alpha )}(X)$ being an inverse, in an appropriate sense, of a parametrized generalization of the truncated exponential given by certain Laguerre polynomials. Such Laguerre polynomials play a role in a grading switching technique for non-associative algebras, previously developed by the authors, because they satisfy a weak analogue of the functional equation $\exp (X)\exp (Y)=\exp (X+Y)$ of the exponential series. We also investigate functional equations satisfied by $G^{(\alpha )}(X)$ motivated by known functional equations for ${\mathcal{L}}_1(X)=-G^{(0)}(X)$.