Let f: C → C be differentiable at zo. Considering ƒ as a map R? → R², prove that f'(zo) = kR where k is a non-negative constant, and R is a 2 x 2 rotation matrix; that is, a matrix of the form cos(e) - sin(0) ] sin(0) cos(0) 1 where 0 E (-T, 7]. If f = u + iv for functions u, v: R² → R. what are k and R in terms of u and v?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Let f: C → C be differentiable at zo. Considering ƒ as a map R? → R², prove
that f'(zo) = kR where k is a non-negative constant, and R is a 2 x 2 rotation
matrix; that is, a matrix of the form
cos(e) - sin(0) ]
sin(0) cos(0)
1
where 0 E (-T, 7].
If f = u + iv for functions u, v: R² → R. what are k and R in terms of u and v?
Transcribed Image Text:Let f: C → C be differentiable at zo. Considering ƒ as a map R? → R², prove that f'(zo) = kR where k is a non-negative constant, and R is a 2 x 2 rotation matrix; that is, a matrix of the form cos(e) - sin(0) ] sin(0) cos(0) 1 where 0 E (-T, 7]. If f = u + iv for functions u, v: R² → R. what are k and R in terms of u and v?
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