
We have so far studied elliptic problems, i.e., stationary problems. We now turn to evolution problems, starting with the archetypal parabolic equation, namely the heat equation. In this chapter, we will present a brief and far from exhaustive theoretical study of the heat equation. We will mostly work in one dimension of space, some of the results having an immediate counterpart in higher dimensions, others not. The study of numerical approximations of the heat equation will be the subject of the next chapter.
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