On the inverse nodal problems for discontinuous Sturm–Liouville operators

In this paper, we discuss the inverse nodal problems for discontinuous Sturm–Liouville operators with Robin boundary conditions. We show that the potential q   up to its mean value on the interval [0,1][0,1] and coefficients h, H  , ba can be uniquely determined by the twin-dense nodal subset on the subinterval [a0,b0][a0,b0], a0<12