By L Dresner

Lie's crew conception of differential equations unifies the various advert hoc equipment recognized for fixing differential equations and gives strong new how you can locate options. the idea has functions to either usual and partial differential equations and isn't constrained to linear equations. purposes of Lie's conception of normal and Partial Differential Equations offers a concise, easy advent to the applying of Lie's thought to the answer of differential equations. the writer emphasizes readability and immediacy of realizing instead of encyclopedic completeness, rigor, and generality. this allows readers to fast grab the necessities and begin using the the right way to locate recommendations. The booklet contains labored examples and difficulties from a variety of medical and engineering fields.

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

**Example text**

1 2 The integral curves of the Clairaut equation y = x j ( 1 y2)1/2form a family of straight lines that define an envelope. (a) Show that this differential equation is invariant to the rotation group 6 = y, = -x. (b) Use this group to show that the envelope is the circle of unit radius centered on the origin. 13 The integral curves of the differential equation define an envelope. Find a group that leaves the differential equation invariant. Determine from the group the equation of the envelope.

So far we know nothing about 8:its value can be infinite, finite or zero; and we can go no further using purely group-theoretic arguments. But if we add some additional hypotheses, we can determine the value of B. For some differential equations for which /3 < 0 it happens that the solutions y(x) that vanish at infinity are ordered according to their values at x = 0. This last statement means that if yl(0) > y2(0) > 0, then yl (x) 3 y2(x) )_ 0 for all x. If the solutions are ordered, then the power-law solution y, = A,xP, where A, is now the smallest positive root of Eq.

6). 3) belongs to the integrating factor ,Y = y-' and thus should leave only the integral curve y = 0 invariant. 3).. p) = co invariant. The most general integrating factor v of Eq. 3) where p is some particular integrating factor and F is an arbitrary function of $. If , Y does not already equal zero for the integral curve, we can make v-I = 0 by choosing F so that F(c,) = W. 4 Singular Solutions General as the work of the last two sections may seem, it is nonetheless based on the tacit assumption that at each point of the (x.