By L Dresner

Lie's staff idea of differential equations unifies the numerous advert hoc equipment recognized for fixing differential equations and gives robust new how one can locate strategies. the speculation has purposes to either usual and partial differential equations and isn't limited to linear equations. functions of Lie's thought of normal and Partial Differential Equations offers a concise, basic advent to the appliance of Lie's thought to the answer of differential equations. the writer emphasizes readability and immediacy of figuring out instead of encyclopedic completeness, rigor, and generality. this permits readers to fast snatch the necessities and begin making use of the the right way to locate suggestions. The publication comprises labored examples and difficulties from a variety of medical and engineering fields.

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**Additional info for Applications of Lie’s Theory of Ordinary and Partial Differential Equations**

**Example text**

1J ), Lie has shown how to reduce the problem of solving it to that of solving two first-order differential equations one at a time successively. Lie's way of doing this is explained in the next section. 3b, c) determine a two-parameter family of curves in the three-dimensional space whose coordinates are x. y and u. (Consider the direction field of infinitesimal vectors dx, dy = y dx, du = udx determined by solving Eqs. Y and u. 3b, c) are invariant to the once-extended group (~, 1], 1Jt}, the transformations of the group carry each of these curves into other curves of the family.

8) which completes the proof. 9) arises in the study of heat transfer in superftuid helium. 1) with f3 = -2. Substitution of the form y = Ax- 2 into the differential equation yields A = 41(3-j3) so that y* = (41[3-J3])x- 2. To show that the positive solutions for which y( oo) = 0 are ordered, we set u =

Thus as x ~ oo, a' ~ oo (remember f3 < 0). This means as the point (x, y) moves out along the solution S toward x = oo, the image point (x', y') moves steadily upwards along the vertical line x' = c. 8) which completes the proof. 9) arises in the study of heat transfer in superftuid helium. 1) with f3 = -2. Substitution of the form y = Ax- 2 into the differential equation yields A = 41(3-j3) so that y* = (41[3-J3])x- 2. To show that the positive solutions for which y( oo) = 0 are ordered, we set u =