%0 Journal Article 
%A Lastra Sedano, Alberto
%A Tahara , Hidetoshi
%T Maillet type theorem for nonlinear totally characteristic partial differential equations
%D 2019
%@ 0025-5831
%U http://hdl.handle.net/10017/41535
%X The paper discusses a holomorphic nonlinear singular partial differential equation (t∂t)mu=F(t,x,{(t∂t)j∂αxu}j+α≤m,j<m)(t∂t)mu=F(t,x,{(t∂t)j∂xαu}j+α≤m,j<m) under the assumption that the equation is of nonlinear totally characteristic type. By using the Newton polygon at x=0x=0, the notion of the irregularity at x=0x=0 of the equation is defined. In the case where the irregularity is greater than one, it is proved that every formal power series solution belongs to a suitable formal Gevrey class. The precise bound of the order of the formal Gevrey class is given, and the optimality of this bound is also proved in a generic case.
%K Matemáticas
%K Mathematics
%~ Biblioteca Universidad de Alcala