By Daniel Alpay

ISBN-10: 2092132172

ISBN-13: 9782092132173

ISBN-10: 2932962973

ISBN-13: 9782932962977

ISBN-10: 3319421794

ISBN-13: 9783319421797

ISBN-10: 3319421816

ISBN-13: 9783319421810

This moment version offers a suite of workouts at the conception of analytic services, together with accomplished and targeted options. It introduces scholars to numerous functions and points of the idea of analytic features now not consistently touched on in a primary path, whereas additionally addressing issues of curiosity to electric engineering scholars (e.g., the belief of rational capabilities and its connections to the speculation of linear structures and country area representations of such systems). It presents examples of vital Hilbert areas of analytic features (in specific the Hardy house and the Fock space), and likewise contains a part reviewing crucial features of topology, useful research and Lebesgue integration.

Benefits of the 2d edition

Rational features are actually lined in a separate bankruptcy. extra, the part on conformal mappings has been expanded.

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**Additional resources for A Complex Analysis Problem Book**

**Sample text**

We have |2 + z n + z 5n | ≥ |2 − |z n + z 5n ||. For |z| < 1 we have |z n + z 5n | ≤ 2|z| < 2, and so 2 − |z n + z 5n | = 2 − |z n + z 5n | ≥ 2 − 2|z| = 2(1 − |z|), and hence the result. 17. It suﬃces to apply the triangle inequality to z1 z2 − 1 = (z1 − 1)(z2 − 1) + (z1 − 1) + (z2 − 1), and then add 1 to both sides of the obtained inequality. 18. 41) with z = |a| and w = −|b|. 19. Let z, w ∈ D. 37) with z1 = 1 and z2 = zw we have |1 − zw| ≥ 1 − |zw| > 0. 40 Chapter 1. 32): |1 − zw|2 − |z − w|2 = (1 − |z|2 )(1 − |w|2 ), ∀z, w ∈ C.

6. 13), we obtain n (1 + i)n = 2 2 cos nπ nπ + i sin . 1) Remark. 6) n (α + β)n = k=0 n k αk β n−k . We then obtain n (1 + i)n = ik k=0 n k (−1)p = p n 2p (−1)p +i p such that n 2p + 1 . 4. 8. Since d arctan u 1 = 2 du u +1 we have and d arctan 1/u 1 1 1 =− 2 , =− 2 du u 1 u +1 + 1 u2 d(arctan u + arctan 1/u) = 0, u = 0. du Thus the function arctan u + arctan 1/u is constant on (−∞, 0) and (0, ∞). Its value on each of these intervals is computed with the choices u = ±1. 36 Chapter 1. 9. (a) The formula for θ follows from the deﬁnition of arctan.

ZN , ⎞ ⎛ N N | z |2 = =1 N ⎜ |z |2 + 2 Re ⎝ =1 ⎟ z zk ⎠ . 14. 28) for w and −w and adding both identities. To prove the following two identities, one proceeds as follows: We have |1 + zw|2 = (1 + zw)(1 + zw) = 1 + zw + zw + |z|2 |w|2 , |1 − zw|2 = (1 − zw)(1 − zw) = 1 − zw − zw + |z|2 |w|2 , and |z − w|2 = (z − w)(z − w) = |z|2 − zw − wz + |w|2 . Thus |1 + zw|2 + |z − w|2 = 1 + zw + zw + |z|2 |w|2 + |z|2 − zw − wz + |w|2 = 1 + |z|2 |w|2 + |z|2 + |w|2 = (1 + |z|2 )(1 + |w|2 ), and |1 − zw|2 − |z − w|2 = 1 − zw − zw + |z|2 |w|2 − (|z|2 − zw − wz + |w|2 ) = 1 + |z|2 |w|2 − |z|2 − |w|2 = (1 − |z|2 )(1 − |w|2 ).

### A Complex Analysis Problem Book by Daniel Alpay

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