Applied Complex Variables for Scientists and Engineers, by Yue Kuen Kwok

By Yue Kuen Kwok

This advent to complicated variable equipment starts by means of rigorously defining advanced numbers and analytic services, and proceeds to provide bills of complicated integration, Taylor sequence, singularities, residues and mappings. either algebraic and geometric instruments are hired to supply the best knowing, with many diagrams illustrating the ideas brought. The emphasis is laid on knowing using tools, instead of on rigorous proofs. through the textual content, the various vital theoretical leads to advanced functionality conception are through correct and brilliant examples in actual sciences. This moment variation now includes 350 stimulating routines of top quality, with recommendations given to lots of them. fabric has been up to date and extra proofs on the various vital theorems in advanced functionality concept are actually incorporated, e.g. the Weierstrass-Casorati theorem. The ebook is extremely compatible for college kids wishing to benefit the weather of complicated research in an utilized context.

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Example text

Ii) By interchanging z1 and z2 in the above inequality, we have |z2 | − |z1 | ≤ |z1 + z2 | . (iii) Combining the results in eqs. (i), (ii) and (iii), we obtain |z1 | − |z2 | ≤ |z1 + z2 | ≤ |z1 | + |z2 | . 2 Find the locus of the points z satisfying |z − α| + |z + α| = 2r , where α is complex and r is real. Discuss various possibilities and find the maximum and minimum values of |z|. Solution The two moduli |z − α| and |z + α| represent the distances from z to α and −α, respectively. By the triangle inequality, |z − α| + |z + α| ≥ 2|α| and so |α| ≤ r.

Iii) Combining the results in eqs. (i), (ii) and (iii), we obtain |z1 | − |z2 | ≤ |z1 + z2 | ≤ |z1 | + |z2 | . 2 Find the locus of the points z satisfying |z − α| + |z + α| = 2r , where α is complex and r is real. Discuss various possibilities and find the maximum and minimum values of |z|. Solution The two moduli |z − α| and |z + α| represent the distances from z to α and −α, respectively. By the triangle inequality, |z − α| + |z + α| ≥ 2|α| and so |α| ≤ r. We consider the following separate cases: (a) |α| < r.

Conversely, to each point P on the sphere, other than the north pole N , we draw the line P N which cuts uniquely one point P in the complex plane. Clearly there exists a one-to-one correspondence between points on the Riemann sphere, except N , and all the finite points in the complex plane. We assign the north pole N as the point at infinity. With such an assignment, we then establish a one-to-one correspondence between all the points on the Riemann sphere and all the points in the extended complex plane.

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Applied Complex Variables for Scientists and Engineers, by Yue Kuen Kwok
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