%0 Journal Article %T Regularized trace of the Sturm-Liouville operator with irregular boundary conditions %A Alexander Makin %J Electronic Journal of Differential Equations %D 2009 %I Texas State University %X We consider the spectral problem for the Sturm-Liouville equation with a complex-valued potential $q(x)$ and with irregular boundary conditions on the interval $(0,pi)$. We establish a formula for the first regularized trace of the this operator. %K Sturm-Liouville operator %K eigenvalue problem %K spectrum %U http://ejde.math.txstate.edu/Volumes/2009/27/abstr.html