A Gaschütz Lemma for linear algebraic groups with applications to the Riemann-Hilbert correspondence

Source abstract

The classical Gaschütz Lemma states that for a surjective morphism $G\to H$ of finite groups, generators $h_1,\ldots,h_d$ of $H$ can be lifted to generators $g_1,\ldots,g_d$ of $G$, provided that $G$ can be generated by $d$ elements. We prove an analog of this statement for linear algebraic groups. This has applications to the algebraic-geometric theory of linear differential equations: We show that every regular singular differential embedding problem over the rational function field has a regular singular solution. We also establish a purely algebraic variant of the Riemann-Hilbert correspondence on the punctured projective line that works over any countable algebraically closed field of characteristic zero.