By L Dresner

ISBN-10: 0750305312

ISBN-13: 9780750305310

Lie's team concept of differential equations unifies the numerous advert hoc equipment recognized for fixing differential equations and offers robust new how one can locate strategies. the idea has functions to either usual and partial differential equations and isn't limited to linear equations. purposes of Lie's concept of standard and Partial Differential Equations presents a concise, uncomplicated creation 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 allows readers to fast snatch the necessities and begin making use of the how to locate suggestions. The booklet contains labored examples and difficulties from quite a lot of medical and engineering fields.

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**Download e-book for kindle: Applications of Lie's Theory of Ordinary and Partial by L Dresner**

Lie's staff idea of differential equations unifies the various advert hoc tools identified for fixing differential equations and gives robust new how you can locate ideas. the speculation has functions 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 presents a concise, uncomplicated creation to the appliance of Lie's idea to the answer of differential equations.

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**Additional resources for Applications of Lie's Theory of Ordinary and Partial Differential Equations**

**Sample text**

Rewritten in terms of x, y and j , Eq. 2). 1, an integrating factor is Integration of Eq.

Thus the singular point P: (0. 4. Now if we approach the point P along the line then it follows from Eq. ( 3 . 5 . 3 ~that ) to leading order as long as m # -3/2. r = s o exp L Z ; 3 ) If we apply l'H6pital's rule to the right-hand side of Eq. 3~). we find that the separatrix S has the slope -3/4 at P. r = -ro, a constant, at P. rO) = 0. xO)/~xO = qp = -2/3 so that j ( x 0 ) = -2xo/3. These two conditions provide initial conditions for a huckkrcrrd integration of Eq. r = 0. Because the slope j(xo) is negative, a backward integration produces a positive solution on the interval (0.

2) for which this is not so. A good example is the differential equation for which there are two real slopes y at each point (x. y) for which y < x + 1/4, one at points for which y = x + 1/4, and none at other points. It can be shown by direct substitution that the one-parameter family where c is a constant, -00 < c < m , satisfies Eq. 1 ). 2), points for which y = x 1 /4 lie on one curve, and other points on none. 1. y =x 21 Curves of the family y = c - (c - x12 and their envelope + 144. + Thus the form +(x.

### Applications of Lie's Theory of Ordinary and Partial Differential Equations by L Dresner

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