Math 5201 Real Variables
Fall 2002
Prof. Peckham
Homeworks and Tests
Text: Real Analysis with Real Applications,
by Kenneth R. Davidson and Allan P. Donsig, Prentice Hall, 2002.
- Set 1 Due Monday Sept. 9:
- Read Preface, Chapter 1: Sections 1.1-1.6
- Section 1.2: Af, D, Ea
- Section 1.4: A, E
(For A: Include the definition of what it means to add two "vectors"
and multiply by a "scalar"; the book assumes this is obvious.)
- Section 1.5: Ba, D
- Section 1.6: Ea
- Set 2 Due Monday Sept. 23 Change to Wednesday Sept. 25:
- Read Sections 2.1 - 2.5, 2.8
- Section 2.1:
- Section 2.2: F
- Section 2.3: Ad, B, D, L
- Section 2.4: A, D, G
- Section 2.5: C
- Section 2.8: G. ALSO: Describe an explicit 1-1, onto map between [0,1] and
(0,1). Hint: Consider the irrationals and rationals separately.
- Set 3 Due Monday Sept. 30:
- Read Sections 2.6, 2.7
- Section 2.5: Extra Credit J (not due on Monday)
- Section 2.6: A, G
- Section 2.7: A, D, E
- Exam 1 Fri. Oct. 4. Covers Chapters 1 and 2.
- Set 4 Due Fri. Oct. 18:
- Read Sections 3.1, 3.2, 3.4
- Section 2.5: J (extra credit)
- Section 3.1: A, D
- Section 3.2: A, B (Hint: use Cauchy Criterion 3.1.5),
C, E (OK to use D), H (extra credit),
I (first part only), K, M, O (extra credit).
Also know how to decide whether the series in
S converge or diverge (not to hand in).
- Set 5 Due Fri. Nov. 1:
- Read Sections 3.4, 4.1 - 4.4
- Section 3.4 B, E
- Section 4.1 E
- Section 4.2 A, B, Ca
- Section 4.3 A, E, L, N
- Section 4.4 A, C, I
- Set 6 Due Wed. Nov. 13:
- Read Sections 5.1 - 5.2
- Section 5.1 B, E, I, Extra Credit: D.
Hint for B: f(-x)=f(x) so you can
restrict to positive x values at first. It might also help to sketch graphs
of f(x) and sec(x) together.
Hint for E: Look how f behaves as you approach the origin along different
parabolas.
- Section 5.2 A, C, G, H
- Exam 2 Wed. Nov. 20. Covers Chapters 3 and 4 and Sections 5.1-5.2.
- Set 7 Due Friday, Dec. 6:
- Section 3.2 S Do any 13 of the 26. Indicate the test(s) used and justify
their use, but you need not prove the tests.
- Read the Inventing Numbers article by David Berlinski.
- Set 8 Due Monday, Dec. 16. Required only for A or A- in course.:
- Read Sections
- Section 5.3 J (4 pts), Extra Credit: H (4 pts)
Possibly useful hint for H: Show g(x,y)=f(x)-y is continuous.
- Section 5.4: B (2 pts), E (3 pts; forward direction only), Extra Credit: A (4 pts)
- Section 5.5: A (4 pts) Alternate (to the book's) hint:
Control the "worst case choice" for a.
- Section 7.1: A (3 pts)
- Section 8.1: A (4 pts)
- Section 9.1: A (2 pts), B (3 pts), C (3 pts),
(4 pts): Do one of the following (or both for extra credit:
- Show that if f:(X,dX)->(Y,dY)
and g:(Y,dY)->(Z,dZ) are continuous maps between
metric spaces, then the composition g o f is continuous.
- Show the shift map sigma: Sigma -> Sigma is continuous, where
Sigma is the set of sequences (s0, s1, ...) with each
si equal to 0 or 1, and sigma defined by
sigma (s0, s1, ...)=(s1, s2, ...).
- Section 11.1:
Prove the contraction mapping theorem for metric spaces:
Let f:(X,d)->(X,d) be a mapping from a complete metric space (X,d)
to itself which
satisfies the property: d(f(x), f(y)) < c d(x,y), for some c in (0,1).
Show that
- (3 pts) the sequence {fn(x)} is Cauchy
- (2 pts) Show That fn(x) -> p, where p is a fixed point.
- (1 pts) Show That for any y in X, fn(y) -> p.
- Section 12.1 A (4 pts) with the differential
equation changed to f'(x)=f(x), f(0)=1.
In showing the solution is valid for all real numbers, you must show that
your series converges for all reals, and that the series satisfies the
differential equation. Recall (from Calc II??) that inside its radius of
convergence, the derivative of a series can be obtained by "term by term
differentiation."
- Corrections to HW's and Tests Due Wednesday, Dec. 18 at 5pm.
Corrections handed in by Monday Dec. 16 at 5pm will be returned and may be
"recorrected."
- Final Exam Mon. Dec. 16, 4-6PM in Chem. 251. Cumulative. Optional -
will only be counted if it raises your test average.
- Grading scheme. The grading scheme on the original syllabus will be honored.
However, if you choose to do so, it may be altered as follows:
Weighting: Test 1 22.5%, Test 2 22.5%, Problem Sets 1-7 55%.
Grading scale
| Grade | | Percentage | Extra |
| A | | 90% | 37/42 on Problem set 8 |
| A- | | 85% | 21/42 on Problem set 8 |
| B+ | | 80% | |
| B | | 75% | |
| B- | | 70% | |
| C+ | | 64% | |
| C | | 57% | |
| C- | | 50% | |
| D+ | | 45% | |
| D | | 40% | |
This page (http://www.d.umn.edu/~bpeckham/www) is maintained by
Bruce Peckham (bpeckham@d.umn.edu)
and was last modified on
Friday, 20-Dec-2002 16:03:16 CST.