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On the theory of nonlocal symmetries of nonlinear partial differential equations. (English. Russian original) Zbl 0604.58053
Sov. Math., Dokl. 29, 337-341 (1984); translation from Dokl. Akad. Nauk SSSR 275, 1044-1049 (1984).
Consider a partial differential equation, which is regarded as a subset $$y\subset {\mathcal J}^ k(\pi)$$, where $$\pi$$ : $$E\to M$$ is a smooth bundle and $${\mathcal J}^ k(\pi)\to M$$ is the bundle of k-jets. To this one associates $$y_{\infty}$$, called ”infinite extension” of $$y$$ which corresponds to the set of formal solutions to the equation and on which one can consider the Cartan distribution C($$y_{\infty})$$. Also consider some infinite-dimensional manifold $$\tilde y_{\infty}$$ with an n- dimensional integrable distribution $$\tilde C:$$ $$y\to \tilde C_ y\subset T_ y(\tilde y_{\infty})$$, $$y\in \tilde y_{\infty}$$ on it. A regular mapping $$\tau$$ : $$\tilde y_{\infty}\to y_{\infty}$$ is called a covering over $$y$$ if the map $$\tau_{*,y}: \tilde C_{\nu}\to C_{\tau (\nu)}(y_{\infty})$$ is an isomorphism for every $$y\in \tilde y_{\infty}$$. The nonlocal symmetries of a differential equation are defined then to be the symmetries of its coverings. The main results from the paper show how one can compute these nonlocal symmetries for the Burgers equation.
Reviewer: O.Liess

##### MSC:
 58J70 Invariance and symmetry properties for PDEs on manifolds 57R50 Differential topological aspects of diffeomorphisms 35Q99 Partial differential equations of mathematical physics and other areas of application 58A20 Jets in global analysis
##### Keywords:
Cartan distribution; nonlocal symmetries; Burgers equation