In this letter I shall review my joint results with Vadim Kuznetsov and Evgeny Sklyanin [Indag. Math. 14 (2003). 451-482] on separation of variables (SoV) for the $A_n$ Jack polynomials. https://safeersappliancers.shop/product-category/elica-thin-90cm-chimney-cooker-hood-stainless-steel/