TY - JOUR
T1 - On a Maximum Principle and Uniqueness Theorems for a System of First Order Equations of Mixed Type
AU - Hesheng Sun  & Yongqian Han 
JO - Journal of Partial Differential Equations
VL - 3
SP - 251
EP - 262
PY - 1996
DA - 1996/09
SN - 9
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jpde/5625.html
KW - System of equations of mixed type
KW - generalized Tricomi type problem
KW - Frankl's problem
KW - auxiliary function
KW - maximum principle
AB -  A maximum principle for a system of first order equations of mixed type is established. The uniqueness theorems of solutions t.o the generalized Tricomi type problem and to the Frankl's problem are proved by the method of auxiliary functions.