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Equivalence classes of related evolution equations and Lie symmetries

E G Kalnins and W Miller Jr

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This is an extension of earlier work (SIAM J. Math. Anal. vol.16, p.221, 1985) by the authors which gives a correspondence between Lie symmetry operators (with non-trivial time dependence) for a given evolution equation and those evolution equations related to the given one by a change of independent and dependent coordinates. They work out the correspondence between symmetries of a system of evolution equations nu t=K(y, v) and those systems us=J(x, u) related to it by a change of coordinates t=T(s, x, u), y=Y(s, x, u), v=V(s, x, u) and show (extending ideas of Humi (1986) and Rosencrans (1976)) how to determine the related equations directly from the symmetry operators without solving a system of differential equations. In general there are multiple evolution equations associated with a given symmetry; for the case of scalar evolution equations they compute explicitly the structure of each equivalence class.


PACS

02.30.Jr Partial differential equations

02.10.De Algebraic structures and number theory

02.10.Ud Linear algebra

02.20.Sv Lie algebras of Lie groups

MSC

35F05 General theory of linear first-order PDE

46G25 (Spaces of) multilinear mappings, polynomials (See also 46E50, 46G20, 47H60)

46G05 Derivatives (See also 46T20, 58C20, 58C25)

11C08 Polynomials (See also 13F20)

Subjects

Mathematical physics

Dates

Issue 16 (11 November 1987)



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