Fernando Barrera Mora On a Theorem of Isaacs. . International Journal of Pure and Applied Mathematics. Vol. 48 , No 4, 491-494 (2008).
I.M. Isaacs has proven a very interesting theorem concerning solvability of polynomials by real radicals. His result deals with an irreducible polynomial over the field of rational numbers which has a real radical element and splits in R. In this note we present a short proof of a generalization of Isaacs Theorem.