By Y. Pinchover, J. Rubenstein

ISBN-10: 0511111576

ISBN-13: 9780511111570

ISBN-10: 052161323X

ISBN-13: 9780521613231

ISBN-10: 0521848865

ISBN-13: 9780521848862

**Read Online or Download An Introduction to Partial Differential Equations PDF**

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**Extra info for An Introduction to Partial Differential Equations**

**Sample text**

Namely, we solve the problem consisting of the convection equation Ct + ∇ · (C u) = 0, and the condition C(x, t0 ) = C0 (x). 43) This problem is called an initial value problem. 43) determines a curve through which the solution surface must pass. 43) by imposing a curve that must lie on the solution surface, so that the projection of on the (x, t) plane is not necessarily the x axis. In Chapter 2 we shall show that under suitable assumptions on the equation and , there indeed exists a unique solution.

This condition is called the transversality condition. (3) So far we have discussed local problems. One can also encounter global problems. For example, a characteristic curve might intersect the initial curve more than once. Since the characteristic equation is well-posed for a single initial condition, then in such a situation the solution will, in general, develop a singularity. We can think about this situation in the following way. Recall that a characteristic curve ‘carries’ with it along its orbit a charge of information from its intersection point with .

46) is called a Dirichlet condition in honor of the German mathematician Johann Lejeune Dirichlet (1805–1859). For example, this condition is used when the boundary temperature is given through measurements, or when the temperature distribution is examined under a variety of external heat conditions. Alternatively one can supply the normal derivative of the temperature on the boundary; namely, we impose (as usual we use here the notation ∂n to denote the outward normal derivative at ∂ ) ∂n u(x, y, z, t) = f (x, y, z, t) (x, y, z) ∈ ∂ , t > 0.

### An Introduction to Partial Differential Equations by Y. Pinchover, J. Rubenstein

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