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Partial Differential Equations and Group Theory - New Perspectives for Applications (Hardcover, 1994 ed.)
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Partial Differential Equations and Group Theory - New Perspectives for Applications (Hardcover, 1994 ed.)
Series: Mathematics and Its Applications, 293
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Ordinary differential control thPory (the classical theory) studies
input/output re lations defined by systems of ordinary differential
equations (ODE). The various con cepts that can be introduced
(controllability, observability, invertibility, etc. ) must be
tested on formal objects (matrices, vector fields, etc. ) by means
of formal operations (multiplication, bracket, rank, etc. ), but
without appealing to the explicit integration (search for
trajectories, etc. ) of the given ODE. Many partial results have
been re cently unified by means of new formal methods coming from
differential geometry and differential algebra. However, certain
problems (invariance, equivalence, linearization, etc. ) naturally
lead to systems of partial differential equations (PDE). More
generally, partial differential control theory studies input/output
relations defined by systems of PDE (mechanics, thermodynamics,
hydrodynamics, plasma physics, robotics, etc. ). One of the aims of
this book is to extend the preceding con cepts to this new
situation, where, of course, functional analysis and/or a dynamical
system approach cannot be used. A link will be exhibited between
this domain of applied mathematics and the famous 'Backlund
problem', existing in the study of solitary waves or solitons. In
particular, we shall show how the methods of differ ential
elimination presented here will allow us to determine compatibility
conditions on input and/or output as a better understanding of the
foundations of control the ory. At the same time we shall unify
differential geometry and differential algebra in a new framework,
called differential algebraic geometry."
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