Day 33 in
Mat430
Last time
:
Next time
:
Today
:
Announcements
Problems pp. 358, #3, 6, 8, 9 (due today, 4/7)
Third Exam next Friday, 4/16
Today's activity, and new assignment:
Wed
4/7
Continue basic integration
Read sections 41-43
Problems: pp. 129, #1bc, 3, 7, 10 (due Wed., 4/14)
Last time: finish example of heat conduction, and begin derivatives
Section 102: A related problem
Derive the form of the isotherms
Discuss other "easy" problems, using Appendix 2. What's an easy temperature distribution to solve for?
How about a rectangular box with two opposing insulated sides, and constant values on the other sides?
How about a rectangular box insulated on all sides? (Really easy! -- where will it equilibrate?)
Now what transforms into a finite rectangular box, and what can a finite rectangular box turn into?
Section 36
We're working with parametric curves
Many of the usual rules work
Some don't, however (e.g. Mean Value Theorem)
Section 37
Anti-derivatives are working for these parametric curves
Complex integration allows us to get a "twofer" sometimes. As an example, we've got
An inequality
Today: Sections 38-40
Section 38: Contours
Definitions:
Arc - parametrized curve
Simple/Jordan arc -- arc w/o self intersections
Simple closed curve / Jordan curve -- intersects with itself only to close
Smooth arc -- differentiable,
on
(a,b)
, and continuous on
[a,b]
.
Contour: piecewise smooth arc
Simple Closed Contour: closed piecewise smooth arc (divides the complex plane into an inside and an outside)
Parametric curves are not unique
Section 39: Contour integrals
Transforming contour integrals into parametrized curves
Most of the usual rules apply
Section 40: Examples
#1a, p. 129
#2a, p. 129
#6
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