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This chapter and the next one are devoted to the problem of resolving algebraic equations by radicals. Given a polynomial with coefficients in a field K, together with its splitting field N over K, the solvability of the equation P(x) = 0 by radicals can be expressed in terms of the existence of a particular sequence of intermediate extensions between K and N (see Chapter 12). By the Galois correspondence, this translates to a property of Galois group Gal(N|K). In this chapter, we introduce the groups having this special property, called solvability.