Abstract
By analogy with the linear vector bundle case, a non-linear partial differential equation on a manifold can be defined as a fibred submanifold Rk of a k-jet bundle. By observing that under natural conditions the first prolongation gives rise to a vector bundle over Rk, (that is, a quasilinear equation), techniques of the linear case are adapted to establish conditions for the formal integrability of the equation.
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Elliott, R.J. Quasilinear resolutions of non-linear equations. Manuscripta Math 12, 399–410 (1974). https://doi.org/10.1007/BF01171083
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DOI: https://doi.org/10.1007/BF01171083