Is there a general solution to:
$A x''+ B x' + C \mathop{\rm sgn}(x')+ D x=0$ where $\mathop{\rm sgn}(x')$ is the sign of $x'$
Is there a general solution to:
$A x''+ B x' + C \mathop{\rm sgn}(x')+ D x=0$ where $\mathop{\rm sgn}(x')$ is the sign of $x'$