By Harold Cohen

ISBN-10: 0387730575

ISBN-13: 9780387730578

* *

*Complex research with functions in technology and Engineering* weaves jointly idea and broad applications in arithmetic, physics and engineering. during this variation there are various new difficulties, revised sections, and a completely new bankruptcy on analytic continuation. This paintings will function a textbook for undergraduate and graduate scholars within the parts famous above.

Key positive factors of this moment Edition:

Excellent insurance of issues similar to sequence, residues and the assessment of integrals, multivalued services, conformal mapping, dispersion family members and analytic continuation

Systematic and transparent presentation with many diagrams to elucidate dialogue of the material

Numerous labored examples and quite a few assigned problems

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**Extra info for Complex Analysis with Applications in Science and Engineering**

**Sample text**

Adding ∂2U/∂x2 obtained from eq. 7a to ∂2U/∂y2 obtained from eq. 27a) Similarly, adding ∂2V/∂x2 obtained from eq. 7b to ∂2V/∂y2 from eq. 28) is called the Laplacian or “del squared” operator in two dimensions. With this definition, eqs. 27 and equivalently eqs. 29 are the two-dimensional Laplace’s equations for U and V. Thus, we see that a pair of functions that satisfy the CR conditions at all points in a region R also satisfy Laplace’s equation in R. Such functions are called harmonic functions.

53b) Exponential representations of trigonometric functions Setting r = 1, eqs. 55 are referred to as the exponential representations of cosθ and sinθ. The exponential representations of tanθ, cotθ, secθ, and cscθ are obtained straightforwardly from these expressions. 56) Hyperbolic functions The hyperbolic functions are defined from the trigonometric functions for imaginary angles. 57) with w real. Then eqs. 59b) cos(iw) = and sin(iw) = from which sinh w = The real functions, cosh w and sinh w, are the hyperbolic cosine and hyperbolic sine of w.

1, it is unnecessary to specify the values of x and y (or r and θ) at which the CR conditions are applied to ez and zN and their derivatives. For these functions, the CR conditions are valid at all finite z and therefore, they are analytic at all finite z. A function that is analytic at all finite z is called an entire function. 1 Derivatives, Cauchy–Riemann Conditions, and Analyticity 43 Referring to eqs. 20, we see that the derivative of each of these functions is the result one obtains by treating z as a single variable, even though it is the sum of two independent variables.

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