Abstract:Von SoP~us LIE in Leipzig. (Die nachs~ehende Arbei~ erschien zum ers~en Male im Fr~ihling 1883 im norwegisehen Archly.) In einer kurzen Note zur Gesellschaff der Wissenschaf~en in GSt~ingen (3. December 1874) gab ich u. A. eine Aufziihlung aller continuirlichen Gruppen yon Transformationen zwischen zwei Variabeln x und y. Ich lenkte ausdrticklich und stark die Aufmerksamkeit darauf, dass sigh hierauf eine Classification und eine ra~onelle In~egrationstheorie aller Differentialgleichungen f(xy~" ... y(,~) -= o,… Show more
“…One can further annull the a n−2 coefficient in Equation (1) for n 2 via the mappings (2) and (3) with f (x) and g(x) defined in terms of h as f = h −2 , g = h 1−n , where h(x) satisfies the second-order equation…”
Section: Laguerre Canonical Formsmentioning
confidence: 99%
“…In particular, the Lie algebraic properties of these equations have attracted considerable attention since the initial seminal works of Lie [1][2][3][4]. One of Lie's profound results was on the complete complex classification of all possible continuous groups acting in the plane.…”
Section: Introductionmentioning
confidence: 99%
“…Lie [2] presented, among other things, a list of all continuous groups of transformations in the complex plane. He further stressed that this be made the basis of a classification and integration of scalar ordinary differential equations which he implicitly carried out (see also [5]).…”
SUMMARYAfter the initial seminal works of Sophus Lie on ordinary differential equations, several important results on point symmetry group analysis of ordinary differential equations have been obtained. In this review, we present the salient features of point symmetry group classification of scalar ordinary differential equations: linear nth-order, second-order equations as well as related results. The main focus here is the contributions of Peter Leach, in this area, in whose honour this paper is written on the occasion of his 65th birthday celebrations.
“…One can further annull the a n−2 coefficient in Equation (1) for n 2 via the mappings (2) and (3) with f (x) and g(x) defined in terms of h as f = h −2 , g = h 1−n , where h(x) satisfies the second-order equation…”
Section: Laguerre Canonical Formsmentioning
confidence: 99%
“…In particular, the Lie algebraic properties of these equations have attracted considerable attention since the initial seminal works of Lie [1][2][3][4]. One of Lie's profound results was on the complete complex classification of all possible continuous groups acting in the plane.…”
Section: Introductionmentioning
confidence: 99%
“…Lie [2] presented, among other things, a list of all continuous groups of transformations in the complex plane. He further stressed that this be made the basis of a classification and integration of scalar ordinary differential equations which he implicitly carried out (see also [5]).…”
SUMMARYAfter the initial seminal works of Sophus Lie on ordinary differential equations, several important results on point symmetry group analysis of ordinary differential equations have been obtained. In this review, we present the salient features of point symmetry group classification of scalar ordinary differential equations: linear nth-order, second-order equations as well as related results. The main focus here is the contributions of Peter Leach, in this area, in whose honour this paper is written on the occasion of his 65th birthday celebrations.
“…The compatibility of this set of six equations gives the above four linearization conditions (2). The remarkable fact is that the linearization criteria are simply R i jkl = 0!…”
Section: Linearizability Of Second Order Odesmentioning
confidence: 97%
“…(The infinitesimal generators of symmetry form a Lie algebra [3].) He obtained criteria for a second order semi-linear ODE to be such that it could be converted to linear form by point transformations [1,2]. He did not go further to deal with systems of ODEs or third order ODEs.…”
Abstract. The linearizability of differential equations was first considered by Lie for scalar second order semi-linear ordinary differential equations. Since then there has been considerable work done on the algebraic classification of linearizable equations and even on systems of equations. However, little has been done in the way of providing explicit criteria to determine their linearizability. Using the connection between isometries and symmetries of the system of geodesic equations criteria were established for second order quadratically and cubically semi-linear equations and for systems of equations. The connection was proved for maximally symmetric spaces and a conjecture was put forward for other cases. Here the criteria are briefly reviewed and the conjecture is proved.
We obtain a complete classification of scalar
th‐order ordinary differential equations for all subalgebras of vector fields in the real plane. While softwares like Maple can compute invariants of a given order, our results are for a general
. The
cases are well‐known in the literature. Further, it is known that there are three types of
th‐order equations depending upon the point symmetry algebra they possess, namely, first‐order equations which admit an infinite dimensional Lie algebra of point symmetries, second‐order equations possessing the maximum 8‐point symmetries, and higher‐order,
, admitting the maximum
dimensional point symmetry algebra. We show that scalar
th‐order equations for
do not admit maximally an
dimensional real Lie algebra of point symmetries. Moreover, we prove that for
, equations can admit two types of
dimensional real Lie algebra of point symmetries: one type resulting in nonlinear equations which are not linearizable via a point transformation and the second type yielding linearizable (via point transformation) equations. Furthermore, we present the types of maximal real
dimensional and higher than
‐dimensional point symmetry algebras admissible for equations of order
and their canonical forms. The types of lower‐dimensional point symmetry algebras which can be admitted are shown, and the equations are constructible as well. We state the relevant results in tabular form and in theorems.
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