Math 327, Professor Loring
Week One, Fall 2004
- I am out of town this week. My graduate student
Dave Worth will give the first lectures.
- I won't have eMail access, but Dave will know how
to forward questions to me.
- A general description.
Week Two, Fall 2004
- I'm back, but ill.
- Homework #1 (due September 8): §2.1, 1(b)(d), 5(b)(c)(e), 9(a); §2.2, 2(c), 3(b), 16; §2.3, 4(b), 6.
Week Three, Fall 2004
- Homework #2 (due September 17):
§2.4, 2(c), 8(b), 13(b); §2.5 3(e), 5(b); §3.1 7, 10(b); §3.2 7(c)(d), 15(b).
Week Five, Fall 2004
- Homework #3 (due October 1): §4.1: 8; §4.2: 7, 9(b), 11(e), 22; §4.3: 10(b), 31(b).
Week Six, Fall 2004
- You'll get your tests back this Monday.
- Your test will show a letter grade, and the more accurate numeric grade on the "GPA scale."
- Info on UPCs from Wikipedia
- More in-depth info on check sums.
- Still more info on checksums
- Why the factor of 3 in the UPC checksum? This is so that the UPC system can detect most transpositions
of adjacent digits. This has no benefit with the bar-code reader itself, but is there
to protect against a common error when the code is manually entered.
- If there is interest, we can cover Verhoeff's Dihedral Group D_5 Check, which
is designed to better defend against the errors common in human input of numbers. This
was proposed in 1969, five years before the UPC was in use, so one wonders
why it was ignored.
Week Seven, Fall 2004
Week Eight, Fall 2004
Week Nine, Fall 2004
Week Ten, Fall 2004
Week Eleven, Fall 2004
Week Twelve, Fall 2004
Homework #7, due Friday 11/19: §9.2 13, 14(b), 18, 20(b)(d)(f); §9.3 2(a), 9.