Some new symmetry algebras are found for the vacuum Einstein equations. Among them there exists an infinite-dimensional algebra representing the symmetries analogous to the generalized symmetries of the integrable nonlinear partial differential equations. © 1993 The American Physical Society
Based on operator identities and their formal adjoints, we derive two symmetry operators for the lin...
Many important features of a field theory, {\it e.g.}, conserved currents, symplectic structures, en...
Vector Bäcklund transformations which relate solutions of the vacuum Einstein equations having two c...
We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimension...
summary:The author reviews the theory of approximate infinitesimal symmetries of partial differentia...
summary:The author reviews the theory of approximate infinitesimal symmetries of partial differentia...
We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimensions...
The Einstein equations describing gravitational fields in vacuum are written as a compact exterior s...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
Einstein vacuum equations, that is a system of nonlinear partial differential equations (PDEs) are d...
In this thesis symmetry methods have been used to solve some differential equations and to find the ...
In this letter, we present a family of second order in time nonlinear partial differential equations...
In this paper, we present a family of second order in time nonlinear partial differential equations,...
Based on operator identities and their formal adjoints, we derive two symmetry operators for the lin...
Many important features of a field theory, {\it e.g.}, conserved currents, symplectic structures, en...
Vector Bäcklund transformations which relate solutions of the vacuum Einstein equations having two c...
We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimension...
summary:The author reviews the theory of approximate infinitesimal symmetries of partial differentia...
summary:The author reviews the theory of approximate infinitesimal symmetries of partial differentia...
We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimensions...
The Einstein equations describing gravitational fields in vacuum are written as a compact exterior s...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
A local generalized symmetry of a system of differential equations is an infinitesimal transformatio...
Einstein vacuum equations, that is a system of nonlinear partial differential equations (PDEs) are d...
In this thesis symmetry methods have been used to solve some differential equations and to find the ...
In this letter, we present a family of second order in time nonlinear partial differential equations...
In this paper, we present a family of second order in time nonlinear partial differential equations,...
Based on operator identities and their formal adjoints, we derive two symmetry operators for the lin...
Many important features of a field theory, {\it e.g.}, conserved currents, symplectic structures, en...
Vector Bäcklund transformations which relate solutions of the vacuum Einstein equations having two c...
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