Half inverse problems for the singular Sturm-Liouville operator

In this paper, we consider the inverse spectral problem for the impulsive Sturm-Liouville differential pencils on $\left[ 0,\pi\right] $ with the Robin boundary conditions and the jump conditions at the point $\dfrac{\pi}{2}$. We prove that two potentials functions on the whole interval and the parameters in the boundary and jump conditions can be determined from a set of eigenvalues for two cases: (i) The potentials are given on $\left(0,\dfrac{\pi}{4}\left( \alpha+\beta\right) \right) .$ (ii) The potentials is given on $\left( \dfrac{\pi}{4}\left( \alpha+\beta\right) ,\dfrac{\pi }{2}\left( \alpha+\beta\right) \right) $, where $0<\alpha<\beta<1$ and $\alpha+\beta>1$, respectively.