讨论如下Dirichlet问题: {ut-Tr[a(t,x)D^2u]+H(t,x,M,Du)=0 (t,x)∈QT=(0,T)×Ω u(t,x)=ψ(t,x) (t,x)∈δPQT 证明了该问题的比较原理,进而获得粘性解的存在性。
The following Dirichlet problem is considered {ut-Tr[a(t,x)D^2u]+H(t,x,M,Du)=0 (t,x)∈QT=(0,T)×Ω u(t,x)=ψ(t,x) (t,x)∈δPQT The comparison theorem is proved, moreover, using the comparison theorem, the existence of viscosity solutions is obtained.