- Welcome back video --
sorry about the sound quality.
- Obviously things are going to be a little different going
forward. I'm sorry that this has happened, for lots of
reasons; but especially for the anxiety and fear that this has
caused.
Let us continue our work in this class, in order to maintain some sense of the normal.
- There have been a few changes to your syllabus. The new improved
version is here.
- Most importantly, we're going to be reducing the workload a
little. We've lost a week, and so we're winnowing down the
material. Check the assignments
page to see exactly how things have changed.
In particular, we've dropped the chapter 7 material. Something had to go, and we figured that you all are most familiar with that.
There has been no change in our exam schedule!
- Most importantly, I've decided to eliminate the project. While
these tend to be fun, they're going to be jettisoned.
I'll be adjusting the weights on homework and exams correspondingly.
- Material will also be delivered a little differently, however. I
will still go over each section, but you will have to put up
with my video presentations of our material (if you wish): I
will continue to walk you through them. So that part will be a
lot like before, only I won't be able to joke around as much
without an audience...:)
- You will continue to do your assignments, but will have to turn
them in electronically. Our exams will be a little more
interesting, as well. These will be timed exams, to take
place during your usual class time. More on those as they
approach.
- I hope that you managed to have a great spring break. But now it's
back to business....
- Your next homework assignment is due tomorrow, Tuesday. Your graph
homework is due Friday.
Our department chair suggests using Microsoft Lens (getting started) to scan your homework to pdfs.
My son just installed the app on his android phone, fired it up, scanned a letter, and sent it to me as a pdf in about two minutes. And he wasn't sweating. So I think that it's doable.
Some of you may actually have a scanner!
At any rate, I'll probably not have any trouble with this audience figuring out how you'll get me your homework. Please do your best to make scans legible, however!
Please, please: put MAT385 and assignment info in the subject line of your message -- I'll be routing all messages using the tag MAT385. It will really help.
- More on graphs: why do I feature this graph?
Perhaps you remember the "four-color problem", about needing no more than four colors to differentiate between countries on an ordinary map. If we think of the countries as nodes, and adjacency as edges, then a map turns into a planar graph. So the question is, can that planar graph always be assigned colors so that no two adjacent nodes are labeled with the same color?
-
Today we wrap up section
6.1: Graphs and Their Representations
- Then we'll move along to section 6.2: Trees and Their Representations
- Questions and answers for homework on sets
- An epidemic of rabies sweeping over Connecticut. In this problem, I treated the towns of Connecticut as nodes, and adjacency as edges.
