Zhang, Kang Qun, Existence and regularity of solution to the generalized Tricomi equation with a singular initial datum at a point, Acta mathematica Sinica. English series (Print) , 28(6), 2012, pp. 1135-1154
In this paper, we study the existence and regularity of a solution to the initial datum problem of a semilinear generalized Tricomi equation in mixed-type domain. We suppose that an initial datum on the degenerate plane is smooth away from the origin, and has a conormal singularity at this point, then we show that in some mixed-type domain, the solution exists and is conormal with respect to the characteristic conic surface which is issued from the origin and has a cusp singularity.