The author considers forced second order nonlinear equations of the type
and calls them of nonlinear limit circle type if every solution x(t) has
and of nonlinear limit point type otherwise (this definition generalizes H. Weyl
’s [Math. Ann. 68, 220-269 (1910)] classification of second order linear differential equations
. The author considers the sublinear case
. Necessary and sufficient conditions are found that such a forced or unforced
equation is of nonlinear limit circle type and also sufficient conditions that it is of nonlinear limit point type.