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Office hours cancelled today (Tuesday, 10/25)

Hi everyone,

I’ve been asked to cover a class for a colleague in the math department today (Tuesday, 10/25), and it overlaps with my office hours.  However, I should be able to arrive at our class a few minutes early, and I’ll be able to spend a some time at the start of class answering questions.

Regards,
Prof. Reitz

A note about grading written proofs

Hi everyone,

I’ve been enjoying reading your first proof-based homework, and I wanted to give a quick description of how I grade them:

Odd problems are worth 4 points, and are graded (almost exclusively) on completion – did you do the problem? If so, you get 4 points.  I will *not* deduct points for minor errors.  I *may* deduct points if I notice something really, really wrong.  I encourage you to do these problems, and then take a look at the answers in the back of the book – this is a great opportunity to see how proofs should look, feel, and read.

Even problems are worth 8 points.  I will be grading these much more carefully, and will be picky about things like using words (not just symbols), giving reasons for each step, and not skipping steps.  Your absolute best opportunity to improve your proof-writing may come from looking at what you missed in these problems!  If any of my comments are not clear, feel free to ask me about them.

Best,

Prof. Reitz

Week 9 Assignments

Written work, Due Thursday, October 27, in class:
Chapter 6 p.116: 3,4,5,8,9
Chapter 7 p129: 5, 9, 10, 12
      **NOTE: this assignment is due on Thursday, instead of on Tuesday, because we have our second exam on Tuesday.
WeBWorK – none
OpenLab – none

 

In-Class Group Project Activity 10/14/16 – Make and Test Conjectures

NOTE: As a component of OpenLab #5, each person should bring to class a conjecture or question about the Bridges and Walking Tours game.

Group Activity (30 min).  Get into your groups, arrange your chairs in a circle, and take 30 minutes to:

1. Each person should share their conjecture with the group.  For each conjecture, the group should decide if they think it is true or false (or don’t know).  The group should record their conclusion for each conjecture.

2. Choose one conjecture (or create a new one) to focus on as a group.  Your goal for the next few weeks will be to try to prove or disprove this conjecture.  Come up with several ideas about how you might prove it.

Group work due after 30 minutes:  Each group will hand in a sheet of paper with the names of the group members, the date, and the following:
– Each member’s conjecture, along with a brief description of what the group thinks – is it true or false?
– Be sure to clearly indicate which of the conjectures the group has chosen to work on – or, if you have created a new conjecture to work on as a group, include that as well.
– Two different ideas about how you might try to prove the chosen conjecture.

Reflection:  To be completed individually after group work is complete, and submitted on paper with your names and the date.  Take 5 minutes to write on the following prompt:

Briefly reflect on the process of working in a group by responding to each of these points:
1.  Describe something you learned.
2.  Describe something you contributed to the group.
3.  How did today’s work change your understanding of your assigned game?

City Tech email seems to be down – post your homework questions here!

Hi everyone,

I can’t seem to access my citytech email (or the citytech website), at 9pm on Thursday evening 10/13/16 – so if you’ve sent me questions about the homework, I won’t see them tonight!  But I do have access to the OpenLab – if you see this message and have a question, you can go ahead and post it here as a comment, I’ll reply in the same way.

Best,
Prof. Reitz

 

Week 8 Assignments

NOTE: The homework assignment for Chapters 4 & 5 has been modified from the original calendar – it includes two additional problems (and one of the problems is now optional).

Written work, Due Tuesday, October 18th, in class:
Chapter 4 p.100: 1, 6, 7, 15, 16
Chapter 5 p.110: 1, 4, 9, 20*
Odd problems are worth 4 points, even problems worth 8 points.
* (Chapter 5 Problem 20 is optional – solutions will receive extra credit)   
WeBWorK 
– none
OpenLab – none

Exam #2 will take place on Tuesday, 10/25 (first half of class).

Calendar update – Date of Exam #2 changed to 10/25

Hi everyone,

The date of your second exam has been changed from Thursday, 10/20, to Tuesday, 10/25.  This change will allow me to grade and return your first homework assignments on proofs (Chapters 4 & 5, due 10/18) prior to the exam, so you can get feedback on your proof-writing (yes, there *will* be proofs on the second exam!).

This change meant a few minor changes to the project timeline, nothing significant.

Hope you all are enjoying the unusual schedule this week and next!

Best,
Prof. Reitz

In-Class Group Project Activity 9/29/16 – Puzzle Making

Group Activity (25 min).  Get into your groups (group assignments appear below), arrange your chairs in a circle, and take 25 minutes to:

1.  Share your responses to OpenLab #4.  Compare your answers to the given examples (do you all agree on the solutions?).  Now share your own puzzles with the group, and discuss.

2.  Create three new puzzles, as tricky as possible (try to stump Prof. Reitz!).

Group work due after 25 minutes:  Each group will hand in a sheet of paper with the names of the groups members, the date, and the three new puzzles created by the group.  You do not need to submit solutions, but you do need to be able to solve the puzzles on request.

Reflection:  To be completed individually after group work is complete, and submitted on paper with your name and the date.  Take 5 minutes to write on the following prompt:

Briefly reflect on the process of working in a group by responding to each of these points:
1.  Describe something you learned.
2.  Describe something you contributed to the group.
3.  How did today’s work change your understanding of your assigned game?

 

Group Assignments

Group 1: Hanan, Ismail, Jeron
Group 2: Jose, Violanda, Kevin, Carter
Group 3: Tyniqua, Sonam, Ahmad
Group 4: Gary,Leonardo, Armando

 

OpenLab #5: Lockhart’s Lament

In 2002, a mathematician named Paul Lockhart wrote an essay called “A Mathematician’s Lament,” a passionate criticism of mathematics education in America.  It has become widely known among mathematicians and mathematics educators – not everyone agrees with everything he says (though many do), but everyone seems to have something to say about “Lockhart’s Lament,” as it is called.  For this week’s assignment, you will read a short excerpt (three pages) from his essay and respond to the prompts below.

Assignment (Due Friday, 10/14/16). Your assignment has three parts:

First, read the section titled “Mathematics and Culture” (pages 3-5) in Lockhart’s essay, (click here).  If you’re interested, I encourage you to read more, starting at the beginning – but this is not required.

Second, write a response to what you read and post it in the comments below.  Your response should be at least 300 words. Your response should represent your own thoughts and opinions on what you read, and can include responses to any or all of the following:

  • What is one thing that you agree with in the reading? Explain why.
  • What is one thing that you do not agree with? Explain.
  • Choose one quote that you think stands out in the reading.  Give the quote, and explain why you chose it.
  • Have you ever had an experience of mathematics as art?
  • On page 5, Lockhart describes mathematics in schools today as “heartbreaking”.  What do you think he means?  Do you agree? How do your own math experiences in school compare to his description?

Third, and most important, I want you to write down a conjecture about the Bridges and Walking Tours game, and bring it with you to class on Friday 10/14 (do NOT post it here).  Consider Lockhart’s example of a triangle drawn inside a rectangle.  He described the process of playing around with this picture, until he arrives at the basic idea for calculating the area of a triangle.  He contrasts this with a traditional math class, in which the formula is given to students without providing them any opportunity to explore the problem on their own.  The bridges and walking tours game is a little like the triangle-rectangle picture – it’s fun to play around with, but you may not be sure what the point is.  You’ve had a chance to play with it a bit, and try some different challenges.  Now what?  Your job is write down a conjecture (a guess!) or a question about your game. If you could have one question answered about your game, what would it be? If you wanted to be a master of your game, and be able to solve any challenge that was given to you, what would you need to know? Write down a conjecture or question about your game, and bring it with you to class on Friday 10/14 (do NOT post it here).

Here is an example: Let’s imagine that you have just been introduced to the game Tic-Tac-Toe.  After playing it for a while, you might come up with one of the following:
Conjecture: The person who goes first always wins.
Question: Is the corner the best move, or the center?
Conjecture: It’s impossible to win, no matter who goes first.

ps.  Paul Lockhart retired from being a first-rate research mathematician in order to teach math at a private elementary school here in Brooklyn, Saint Ann’s School, where he says “I have happily been subversively teaching mathematics (the real thing) since 2000.”

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