444 Home Page

1. Week 10/01-05

2. Week 10/08-12

3. Week 10/15-19

4. Week 10/22-26

5. Week 10/29-11/2

6. Week 11/05-09

7. Week 11/12-16

8. Week 11/19-23

9. Week 11/26-30

10. Week 12/03-07

11. Week 12/10-14

Monday 12/3 444

• Assignment due Monday: Read Brown 2.4 and 2.6 and do problems #1, 2, 3 in 2.4 and #1, 2, 3 in 2.6. Be prepared to do the same or similar problems in class. This will not be turned in as a written assignment.
• Extra Credit Assignment. Redo the Quiz 2 for homework credit. Everyone needs to do this in whole or in part.
• Handouts given out included (a) a set of worksheets on kaleidoscopes or point symmetry (b) a blank multiplication table for the triangle (c) sheets showing regular tessellations of the plane by triangles, squares and hexagons. (d) a sheet explaining frieze patterns (not discussed yet) and (e) the assignment sheet.

Wednesday 12/5 444

• Assignment Due Wed. An assignment on tesselations and plane symmetry.

Wednesday 12/5 487

• Lab 10 is about Dilations.
• Assignment due Friday 12/7 is based on lab.

Other handouts are not on the web (a copy is in the bin outside my office)

• "An Eye for Similarity Transformation" - this is needed for the lab and also for the assignment.
• Handout on tessellation by 2 square from Wells, Hidden Connections, Double Meanings. This relates to the homework due today.

These two handouts concern the facts about plane symmetry discussed in lecture today:

• Notation for one-color Designs and Patterns from Washburn and Crowe, Symmetries of Culture.
• Two dimensional symmetry from Kinsey and Moore, Symmetry Shape and Space.

Finally, some links to web sites about symmetry were emailed to the class listserve.

Friday 12/7 444

• Assignment on dilations due.
• Discussion of dilations.
• Concept of conjugation presented, with implications of possible patterns of centers in symmetry groups.
• Hurried discussion of dissections. One page of squares shows how to cut one big square into two small ones. Another way is shown at this link.
• Handouts: (1) multipage on generating patterns from 90-degree rotations (2) one-page on conjugation (2) pages of tessellations by squares and triangles for homework (3) two pages of tessellations (by 2 squares and by crosses) for dissection homework.