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Elementary Theory of Analytic Functions of One or Several Complex Variables
Henri Cartan
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eBook - ePub
Elementary Theory of Analytic Functions of One or Several Complex Variables
Henri Cartan
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About This Book
Noted mathematician offers basic treatment of theory of analytic functions of a complex variable, touching on analytic functions of several real or complex variables as well as the existence theorem for solutions of differential systems where data is analytic. Also included is a systematic, though elementary, exposition of theory of abstract complex manifolds of one complex dimension. Topics include power series in one variable, holomorphic functions, Cauchy’s integral, more. Exercises. 1973 edition.
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CHAPTER I
Power Series in One Variable
1.
Formal Power Series1.
ALGEBRA OF POLYNOMIALSLet K be a commutative field. We consider the formal polynomials in one symbol (or âindeterminateâ) X with coefficients in K (for the moment we do not give a value to X). The laws of addition of two polynomials and of multiplication of a polynomial by a âscalarâ makes the set K[X] of polynomials into a vector space over K with the infinite base
Each polynomial is a finite linear combination of the Xn with coefficients in K and we write it , where it is understood that only a finite number of the coefficients an are non-zero in the infinite sequence of these coefficients. The multiplication table
defines a multiplication in K[X]; the product
is , where
This multiplication is commutative and associative. It is bilinear in the sense that
for all polynomials P, P1 P2, Q, and all scalars λ. It admits as unit element (denoted by 1) the polynomial such that a0 = 1 and an = 0 for n > 0. We express all these properties by saying that K[X], provided with its vector space structure and its multiplication, is a commutative algebra with a unit element over the field K; it is, in particular, a commutative ring with a unit element.
2.
THE ALGEBRA OF FORMAL SERIESA formal power series in X is a formal expression , where this time we no longer require that only a finite number of the coefficients an are non-zero. We define the sum of two formal series by
and the product of a formal series with a scalar by
The set K[[X]] of formal series then forms a vector space over K. The neutral element of the addition is denoted by 0; it is the formal series with all its coefficients zero.
The product of two formal series is defined by the formula (1.1), which still has a meaning because the sum on the right hand side is over a finite number of terms. The multiplication is still commutative, associative and bilinear with respect to the vector structure. Thus K[[X]] is an algebra over the field K with a unit element (denoted by 1), which is the series such that a0 = 1 and an = 0 for n > 0.
The algebra K[X] is identified with a subalgebra of K[[X]], the subalgebra of for...