By Yehuda Pinchover and Jacob Rubinstein

ISBN-10: 0511111576

ISBN-13: 9780511111570

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**Additional resources for An introduction to partial differential equations**

**Sample text**

6) Since we are actually dealing with an ODE, the solution is immediate: x u(x, y) = ec0 x e−c0 ξ c1 (ξ, y)dξ + y . 5)). Before doing so, let us draw a few conclusions from this simple example. e. we actually solved an inﬁnite set of ODEs. 5). 5) and an initial condition? 8) 0 where the function T (y) is determined by the initial condition. There are examples, however, where such a function does not exist at all! 5) in which c1 ≡ 0. 8) now becomes u(x, y) = ec0 x T (y). 6) with the condition u(x, 0) = 2x.

To see this observe that the transversality condition fails again, but now the initial curve is not a characteristic curve. Thus there is no solution. 10. This is the case where the transversality condition does not hold on isolated points (as was indeed the case in some of the preceding examples). It is difﬁcult to formulate universal statements here. Instead, each such case has to be analyzed separately. 6 The Lagrange method First-order quasilinear equations were in fact studied by Lagrange even before Hamilton.

They are called the system of characteristic equations or, for short, the characteristic equations. The solutions are called characteristic curves of the equation. e. there is no explicit dependence upon the parameter t. In order to determine a characteristic curve we need an initial condition. We shall require the initial point to lie on the initial curve . Since each curve (x(t), y(t), u(t)) emanates from a different point (s), we shall explicitly write the curves in the form (x(t, s), y(t, s), u(t, s)).

### An introduction to partial differential equations by Yehuda Pinchover and Jacob Rubinstein

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