The concept of a simple point of an abstract algebraic variety
Oscar Zariski · Transactions of the American Mathematical Society · 1947
simple loci.39 10.1.Algebraic ground field extensions.39 10.2.Jacobian criterion for absolutely simple loci.41 11.Intrinsic characterizations of absolutely simple loci.43 11.1.Differential characterization.43 11.2.Direct verification of the local character of the definition.44 11.3.André Weil's criterion.