120A Hmwork (F2018)
Home 120A Hmwork (F2018) Announcements Test Information 

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Assignments may change!  Please re-check this page before doing each homework assignment!

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Please observe the following neatness guidelines for homework that you turn in to be graded; homework not conforming to these guidelines will not receive full credit and may not be graded at all.

  1. Use clean, white paper (preferably ruled) that is not torn from a spiral notebook.

  2. Write your name clearly on the front page of your completed assignment.

  3. Write clearly and legibly.

  4. Clearly number each solution and present them in numerical order.

bulletProblems are from Brown and Churchill, "Complex Variables and Applications,"  9th edition unless otherwise indicated.
If I write
S2:  3, 4, 10 : it means do problems 3, 4 and 10 at the end of Section 2 of the 9th ed. of the book.

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Homework #0: ("Due" Thursday, September 27)

S2:  3, 4, 10          [Algebraic properties of C]
S3:  1                    [Basic arithmetic]
S5:  1ab, 3, 4, 5.    [Euclidean geometry and triangle inequality]

These problems on basic properties of complex numbers  will not be collected but they will be covered in sections on Thursday, September 27.
This material will be covered on the tests.
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Homework #1: (Due Thursday, October 4 in the drop box by 5:00PM.)

S6: 2, 8, 14                     [complex conjugation]
S9: 1, 4, 5cd, 6, 9, 10      [Polar form of complex numbers and properties.]
S11: 1, 2, 6, 7                 [roots of complex numbers]
S42: 2, 3, 4                     [complex functions of a real variable, differentiation and integration]
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Homework #2:   (Due Thursday, October 11 in the drop box by 5:00PM)

Problems 6.1 and 6.2 in the following file: Taylor Exercises.pdf.  [Looking at e^z another way.]
S43: 1                           [Change of variables in complex integrals.]
S12
: 1 -- 3                     [Regions in the plane]
S14
: 1 -- 3                     [Domains of functions]
S18:  5, 9, 10, 11           [Limits and continuity ]
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Homework #3:  (Due Thursday, October 18 in the drop box by 5:00PM.)

S14:  5, 6, 8                                            [mapping properties of functions]
S20:  1, 2, 3, 4,  9 (Do not hand in #9.)    [Complex Differentiation]
S24: 1b, 1c, 3b                                       [Cauchy Riemann Equations.]

S26:
1a, 1c, 2a, 2b, 4                             [More examples of analytic functions]
S30: 2, 6                                                [Exponential function as an analytic function]

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TEST #1:  Monday, October 22 at 12:00noon in Class. Covers material above.
Please bring a Blue Book to the test.
 
Here is a study guide:  120A-Test1-Study-Guide.pdf .  There will be no cheat sheet for the first midterm.

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Homework #4:  (Due Thursday, October 25 in the drop box by 5:00PM.)

S38: 2, 3, 7, 11, 15        [Trig. functions and their properties]
S39: 1,  7a,b, 10, 15      [Hyperbolic functions and their properties]  

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Homework #5:   (Due Thursday, November 1 in the drop box by 5:00PM.)

S33: 1, 2c, 3, 8*           [Logarithms]
S34: 1, 5                     [Logarithms continued.]
S36: 1, 2, 6, 8a            [Power functions]

S40: 1a, 1b, 4              [Inverse Trig. and Hyperbolic functions]

*S33 #8 should have been written as follows. Find all z such that iπ/2 is in log(z).

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Homework #6:  (Due Thursday, November 8 in the drop box by 5:00PM.)

S46: 1, 3, 6, 10         [Contour integrals.]
S47: 1, 2, 7               [Estimating contour integrals]
S49: 2, 4, 5               [Anti-derivatives and the fundamental theorem of calculus]
S53: 1a-c, 2, 3, 4*     [The Cauchy - Goursat theorem]

* Look at S53 #4 but do not hand in!
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TEST #2:  Friday, November 9 at 12:00 Noon in Class.  The focus of the test is on the material in Homeworks 4-6.
Please bring a Blue Book and your student ID to the test.  You are allowed a single one sided (of a standard 8.5''x11'' sheet of paper) "cheat" sheet. Here is a study guide for the second test:  120A-Test2-Study-Guide.pdf

Veterans Day in the following Monday, November 12 so only one lecture day for next homework!
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Homework #7:  (Due Thursday, November 15 in the drop box by 5:00PM.)

S57: 1a)-d), 3,  4, 7 10 (10 is not to be handed in.)   [Cauchy integral formula and its consequences]
 
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No homework due on November 22 because of Thanksgiving.
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Homework #8: (Due Thursday,  November 29 in the drop box by 5:00PM.)

1. Let 0<a<b<oo. Evaluate* the following integral

 

*Hint: use the same sort of method done in class to compute Fourier transform of 1/(1+x^2).

Also do the following problems from the book.

 
S59: 4                           [Maximum modulus principle] This problem is no longer due.
S61: 2, 4, 6                   [Series of complex numbers]
S65: 1-3, 4,  9, 10a.      [Maclaurin Series = Taylor Series centered at 0.]
S68:  1-3.                     [Laurent Series]

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Homework #9: (Due Thursday, November 7 in the drop box by 5:00PM.)

S72:  1-3.         [Manipulating Power Series (substitutions, differentiation, integration)]
S73:  1, 4, 5     [Multiplication and Division of Power Series]
S86: 3, 4, 9      [Evaluating integrals Involving Rational Functions] 
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Final Exam:  Thursday December 13,  11:30am - 2:30pm in Peterson Hall, Room 102.

bulletThe final is cumulative.
bulletPlease bring a Blue Book and your student ID to the test. 
bulletYou are allowed a single two sided (of a standard 8.5''x11'' sheet of paper) "cheat" sheet.
bulletHere is a final study guide.  120A Final Exam Study Guide