Please answer correctly. that f tC2) s uestion Show analytic and real-valued on a- domain D)...
everywhe 4. Let f be a real-valued analytic function in a domain D. Prove that f() must be constant throughout D.
f(D) CL/ D. If either 310 pts]. Let f be an analytic function defined on a domain or f(D) C C where f (D) denotes the range of f, L is any straight line and C is any circle in C, then show that f must be constant in D.
f(D) CL/ D. If either 310 pts]. Let f be an analytic function defined on a domain or f(D) C C where f (D) denotes the range of f, L...
11. (8)(a) Suppose that f and g are analytic branches of zt on a domain D such that 0 g D Show that there is a fifth root, wo, of 1 such that f(z)-wog(2) for all E D. I suggest considering h(z) f (z)/g(z) (b) Now suppose that D D C(-,0]. Let f be an analytic branch of zt in D such that f (1) 1. Show that f(z) expLog(2)) for all z ED.
11. (8)(a) Suppose that f and...
6. Let D be a bounded domain with boundary B. Suppose that f and g are both analytic on D and continuous on Du B, and suppose further that Re /(z)- Re g(z) for all z e B. Show that J-g + ία in D, where α is a real constant.
6. Let D be a bounded domain with boundary B. Suppose that f and g are both analytic on D and continuous on Du B, and suppose further that...
8. Let f be analytic on a bounded domain D and continuous on Du B, where B is the boundary of D. Show that if f is never zero on D, then the minimum of lfl is assumed on B. You will need to use the fact that lfl does, indeed, assume a minimum somewhere on D B
8. Let f be analytic on a bounded domain D and continuous on Du B, where B is the boundary of D....
(b) Suppose f is analytic in a neighborhood of the closed and bounded nonempty domain D. Assuming that f(z) # 0 for all z e D, show that the minimum value of \f| is achieved on the boundary ƏD of D. (Bonus: can you give a contradiction to the above statement if you assume f vanishes at a point in the interior of D?)
Consider a real-valued function u(x, y), where x and y are real variables. For each way of defining u(x, y) below, determine whether there exists a real-valued function v(x, y) such that f(z) = u(x, y) + iv(x, y) is a function analytic in some domain D C C. If such a v(x, y) exists, find one such and determine the domain of analyticity D for f(z). If such a v(x, y) does not exist, prove that it does not...
12. Suppose that fis analytic on a convex domain D and that Re(f ,(z)) > 0 for all z E D. Show that f is one-to-one on D. (Hint: /(z2) - sz) J,f'(w) dw, where is the line segment joining z1 to z2.)
12. Suppose that fis analytic on a convex domain D and that Re(f ,(z)) > 0 for all z E D. Show that f is one-to-one on D. (Hint: /(z2) - sz) J,f'(w) dw, where is the...
Problem 3: a) Show that is f(t) is an even, real valued periodic function of time with period To, then 0 f(t)dt ao = T. Jo b) Show that is f(t) is an odd, real valued periodic function of time with period To, then an-0 f (t) sin(nwot)dt
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3. This problem shows that the metric space of continuous real-valued functions C([0, 1]) on the interval [0, 1is complete. Recall that we use the sup metric on C([0,1), so that df, 9) = sup{f (2) - 9(2): € (0,1]} (a) Suppose that {n} is a Cauchy sequence in C([0,1]). Show that for each a in 0,1], {Sn(a)} is a Cauchy sequence of real numbers. (b) Show that the sequence {fn(a)} converges. We define f(a)...