  We consider the equation - y"(x)+q(x)y(x)=f(x), x\in R and the weighted
function space S_p^{(2)}(R,q)=\{y\in
AC_{\loc}^{(1)}(R):\|y"-qy\|_p+\|q^{1/p}y\|_p<\infty\}; p\in[1,\infty), f\in
L_p(R)$ and $0\le q\in L_1^{\loc}(R)$. We show that there exists an embedding
S_p^{(2)}(R,q)\hookrightarrow L_p(R) if and only if equation above is correctly
solvable in $L_p(R).
