# Category Archives: Announcements

Hi everyone,

Check out the message below from Prof. Seto. Â I encourage you all to take this survey, asÂ this is one of the ways that the college makes decisions about its programs and needs.

You may share the link on Blackboard, through emails or your Openlab sites.Â

Prof. Reitz

# Update to the Final Exam Review

Hi everyone,

After checking in with Prof. Thiell, I have revised the Final Exam reviewÂ to eliminate the following problems:

• Problem 18e
• Problem 19ab
• Problem 18c could be on the final, but I will not ask the final part (“find a formula for the inverse”)

Regards,
Prof. Reitz

ps. This was takenÂ last TuesdayÂ in Kolkata (Calcutta) at the Victoria Memorial, dedicated to the memory ofÂ Queen Victoria and aÂ reminder of India’s colonial history. India was once a British colony (like America), and achieved independence in 1947.

# Exam 3 Grades are posted

Hi everyone,

Exam 3 grades are posted – send me an email if you’ve forgotten the password to the GRADES page.

Regards,
Prof. Reitz

# Group Paper draft Feedback

Hi everyone,

I enjoyed reading the drafts of your papers very much – thanks! Â I’ve sent feedback to each group, copying all group members, by email. Â If you didn’t receive anything, please let me know and I’ll resend it (I used the email addresses that I pulled from cunyfirst at the beginning of the semester, but I’m not sure if they are all accurate).

If you have questions about any of my comments, please let me know. Â As a reminder, your final draft is due in class on Thursday, December 3 (by email or hard copy).

Regards,
Prof. Reitz

# Exam 3 Review notes

Hi everyone,

Two comments on the Exam 3 Review sheet:

1. Â In class, I proposed a strategy for solving problem #2, which was toÂ break into cases based on the remainder when n was divided by 4. Â While I believe this strategy will work, it is simpler to simply look at the cases “n is odd” and “n is even”. Â Despite my comments in class, this method really will work (can anyone explain why?)
2. It looks like the answerÂ for problem #7 in the answer key was all wrong – I’m not sure what happened. Â In any case, I’ve updated it, so it should now be correct.

Both of these corrections were due to a diligent student who will remain nameless (but, in fact, it was Irania – nice work!).

Let me know if you find anything else,

Prof. Reitz

# Exam 3 Review Sheet is posted

Exam 3 will take place on Tuesday, November 24th. Â The review sheet and answer key have been posted on the Handouts page.

Best,
Prof. Reitz

Hi everyone,

Your midsemester grades are posted on the GRADES page – these include the work you’ve done so far on homework (WeBWorK and written work), the OpenLab, the project, and the first two exams. Â Let me know if you have any questions.

Best,
Prof. Reitz

# Homework Chp 5 Update – problem #20

Hi everyone,

Problem #20 in Chapter 5 uses an idea that we have *not* yet covered in class. Â It is no longer a required problem – you don’t have to do it – but I will give you extra credit if you turn in a solution. Â This is excellent practice in reading and applying a definition (just as we have been doing for the definitions of odd, even, divides, and so on). Â The problem reliesÂ on a new definition, that of congruence mod n – itÂ appears in the book as Definition 5.1 on page 105, but I will also give it here:

Definition. Â Given integers a and b, and $n \in \mathbb{N}$, we say “a is congruent to b mod n”, orÂ $a \equiv b \pmod n$, if
$n | (b-a)$.

For example, if are told that $x \equiv 7 \pmod 3$, then we can conclude:
$3|(7-x)$ Â (by the definition of congruence), and
$7-x = 3k$ for some integer $k$ (by the definition of divides)

Hope this helps! Â Please write back and let me know if you have any questions.

Best of luck,
Prof. Reitz

# Office hours cancelled Tues 10/13

Hi everyone,

Due a meeting conflict, I mustÂ cancel my office hours on Tuesday 10/13. Â If you’d like to schedule another time to meet with me please let me know.

Regards,
Prof. Reitz

# Exam #2 Review Sheet is posted

Hi everyone,

Your second exam will take place on Thursday, 10/22. Â The review sheet is posted on the OpenLab (under Classroom Resources/Exam Reviews). Â The answer key comes afterÂ the questions in the document – please let me know by email or here on the OpenLab if you discover an error or have a question.