Suppose f(z) is a holomorphic function in a domain U, and z0 ∈ U. Prove that f has a zero of orde...
Suppose f(z) is a holomorphic function in a domain U, and z0 ∈ U. Prove that f has a zero of order m at z0 if and only if f(z) = g(z)(z − z0)^m, where g(z) is holomorphic in U and g(z0) not equal to 0.
Please prove both directions of the if and only if statement and use series expansion to prove. We have not learned calculus of residues yet.
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Suppose f(z) is a holomorphic function in a domain U, and z0 ∈ U. Prove that f has a zero of orde...
Suppose f : B(0.1) C is holomorphic, with irg:) 1 for every z є B(0,1). Suppose also that f(0)-0, so f(z)g(2) for some holomorphic function g: B(0,1)C. (a) By applying the Maximum Principle to g on B...
Suppose f : B(0.1) C is holomorphic, with irg:) 1 for every z є B(0,1). Suppose also that f(0)-0, so f(z)g(2) for some holomorphic function g: B(0,1)C. (a) By applying the Maximum Principle to g on B(0, r) where 0 < r < 1 , deduce that If( S for every 2E (0, 1) . (b) Show also that |f'(0) S1 (c) Show that if lf(z)- for some z B(0,1)\(0), or if If,(0)| = 1 , then there is a...
Complex Analysis (use the Liouville equation): Suppose that f(z)u, ) (, u) is an entire function such that 7u9n is bounded. Prove that fis constant Hint: Multiply f by an appropriate complex constant...
Complex Analysis (use the Liouville equation):
Suppose that f(z)u, ) (, u) is an entire function such that 7u9n is bounded. Prove that fis constant Hint: Multiply f by an appropriate complex constant.
Suppose that f(z)u, ) (, u) is an entire function such that 7u9n is bounded. Prove that fis constant Hint: Multiply f by an appropriate complex constant.
Suppose fis an entire function such that there is a number M such that Re(f(z)2 -...
Suppose fis an entire function such that there is a number M such that Re(f(z)2 - Imf(z))2 s M for all z. Prove that f must bie Hint: Compare to exercises #8: if f and g are both entire, then so are f-g and gof. Find an appropriate g so that you may apply Liouville's theorem to the entire function gof
Olomorphic. f F has a maximum value on U, then f is constant. One proof follows a line of reasoni...
Task 204！
olomorphic. f F has a maximum value on U, then f is constant. One proof follows a line of reasoning that is typical for analytic functions, by which information nea one point can be transferred to other points by moving along a contour. Suppose Ifl has a maximun value at zo. Then the local version of the maximum modulus principle implies that f must be constan near zo. Consequently, the Taylor series of f at any point near...
1. (20pts=7+5+8) (a) Find the order of the zero z = 0 of the function f(3)...
1. (20pts=7+5+8) (a) Find the order of the zero z = 0 of the function f(3) = ** (e*- 1). (b) Let 2 denote the principal branch of z3. Can in power of z in the annular domain be expanded in Laurent's series ann (0;0, R) = {2 € C:0< |2|< R} for some R >0? (c) Find the Laurent series in powers of 2 (i.e., Zo=0) that represents the function f(3) = in the annular domain 1 < 121...
12. Let D = {2E C | 너く1} denote the open unit disc and let f : D → C be a holomorphic function. Suppose that for any integer n>1 we have that f(1/n)-1/n3. Show that f(z)3. 12. Let D = {2E C...
12. Let D = {2E C | 너く1} denote the open unit disc and let f : D → C be a holomorphic function. Suppose that for any integer n>1 we have that f(1/n)-1/n3. Show that f(z)3.
12. Let D = {2E C | 너く1} denote the open unit disc and let f : D → C be a holomorphic function. Suppose that for any integer n>1 we have that f(1/n)-1/n3. Show that f(z)3.
2. Prove the following: Lemma 1. Consider a function f, defined for all positive integers. Suppose...
2. Prove the following: Lemma 1. Consider a function f, defined for all positive integers. Suppose that for all u, v with ulv we have f(u) * f(0) = k* f(u), for some constant k. Then f(x) = k * 9(2) for some multiplicative function g. (Here, * indicates ordinary multiplication.) Proof.
please explain, not just an answer. No cursive please. Suppose that we define a function f(x) in a piecewise manner - f(z) () for x < a and f(x) = h(x) for x > a. Here, assume that g(z) and...
please explain, not just an answer. No cursive please.
Suppose that we define a function f(x) in a piecewise manner - f(z) () for x < a and f(x) = h(x) for x > a. Here, assume that g(z) and h(z) are differentiable functions. Show that f is differentiable at a if and only if f(a) g(a) and f'(a) g'(a).
Suppose that we define a function f(x) in a piecewise manner - f(z) () for x a. Here, assume that...
Complex Analysis: . (a) Find a single function f(z) which has all of the following properties:...
Complex Analysis:
. (a) Find a single function f(z) which has all of the following properties: f(z) is discontinuous at the origin z = 0, at z = 1, and at all points z with Arg(z) = 7/4, but f(z) is continuous at all other points of C; • f(z) has a simple zero at z = :i; and f(z) has a pole of order 3 at z = n. Justify that your function f(x) has each of the properties...
Suppose f : B(0.1) C is holomorphic, with irg:) 1 for every z є B(0,1). Suppose also that f(0)-0, so f(z)g(2) for some holomorphic function g: B(0,1)C. (a) By applying the Maximum Principle to g on B(0, r) where 0 < r < 1 , deduce that If( S for every 2E (0, 1) . (b) Show also that |f'(0) S1 (c) Show that if lf(z)- for some z B(0,1)\(0), or if If,(0)| = 1 , then there is a...
Complex Analysis (use the Liouville equation):
Suppose that f(z)u, ) (, u) is an entire function such that 7u9n is bounded. Prove that fis constant Hint: Multiply f by an appropriate complex constant.
Suppose that f(z)u, ) (, u) is an entire function such that 7u9n is bounded. Prove that fis constant Hint: Multiply f by an appropriate complex constant.
Suppose fis an entire function such that there is a number M such that Re(f(z)2 - Imf(z))2 s M for all z. Prove that f must bie Hint: Compare to exercises #8: if f and g are both entire, then so are f-g and gof. Find an appropriate g so that you may apply Liouville's theorem to the entire function gof
Task 204！
olomorphic. f F has a maximum value on U, then f is constant. One proof follows a line of reasoning that is typical for analytic functions, by which information nea one point can be transferred to other points by moving along a contour. Suppose Ifl has a maximun value at zo. Then the local version of the maximum modulus principle implies that f must be constan near zo. Consequently, the Taylor series of f at any point near...
1. (20pts=7+5+8) (a) Find the order of the zero z = 0 of the function f(3) = ** (e*- 1). (b) Let 2 denote the principal branch of z3. Can in power of z in the annular domain be expanded in Laurent's series ann (0;0, R) = {2 € C:0< |2|< R} for some R >0? (c) Find the Laurent series in powers of 2 (i.e., Zo=0) that represents the function f(3) = in the annular domain 1 < 121...
12. Let D = {2E C | 너く1} denote the open unit disc and let f : D → C be a holomorphic function. Suppose that for any integer n>1 we have that f(1/n)-1/n3. Show that f(z)3.
12. Let D = {2E C | 너く1} denote the open unit disc and let f : D → C be a holomorphic function. Suppose that for any integer n>1 we have that f(1/n)-1/n3. Show that f(z)3.
2. Prove the following: Lemma 1. Consider a function f, defined for all positive integers. Suppose that for all u, v with ulv we have f(u) * f(0) = k* f(u), for some constant k. Then f(x) = k * 9(2) for some multiplicative function g. (Here, * indicates ordinary multiplication.) Proof.
please explain, not just an answer. No cursive please.
Suppose that we define a function f(x) in a piecewise manner - f(z) () for x < a and f(x) = h(x) for x > a. Here, assume that g(z) and h(z) are differentiable functions. Show that f is differentiable at a if and only if f(a) g(a) and f'(a) g'(a).
Suppose that we define a function f(x) in a piecewise manner - f(z) () for x a. Here, assume that...
Complex Analysis:
. (a) Find a single function f(z) which has all of the following properties: f(z) is discontinuous at the origin z = 0, at z = 1, and at all points z with Arg(z) = 7/4, but f(z) is continuous at all other points of C; • f(z) has a simple zero at z = :i; and f(z) has a pole of order 3 at z = n. Justify that your function f(x) has each of the properties...
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