TY - JOUR T1 - Modified Tricomi Problem for a Nonlinear System of Second Order Equations of Mixed Type AU - Hesheng Sun JO - Journal of Partial Differential Equations VL - 2 SP - 106 EP - 110 PY - 1999 DA - 1999/12 SN - 12 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/jpde/5529.html KW - Nonlinear system of second order equations of mixed type KW - modified Tricomi problem: energy integral method: Leray-Schauder's fixed point principle AB - In this paper a nonliuear system of second order equations of mixed type is considered. The existence of H¹ strong solution for the modified Tricomi problem is proved by the energy integral method and the Leray-Schauder's fixed point principle.