On each homework assignment, please write (i) your name, (ii) name of course, and (iii) homework number. You are allowed and encouraged to work together on homework. Yet, each student is expected to turn in his or her own work. In general, late homework will not be accepted. However, you are allowed to turn in up to three late homework assignments with no questions asked. Unless you have made arrangements in advance with me, homework turned in after class will be considered late. When doing your homework, I encourage you to consult the Elements of Style for Proofs as a reference.


The following assignments are to be turned in at the end of the indicated class period. I reserve the right to modify the assignment if the need arises. These exercises will form the basis of the student-led sharing of solutions/proofs each day. Homework assignments will be graded on a $\checkmark$-system. During class, you are only allowed to annotate your homework using the colored marker pens that I provide.

  • Homework 1: Read the syllabus and write down 5 important items. Note: All of the exam dates only count as a single item. Turn in on your own paper at the beginning of class. (Due Friday, January 20)
  • Homework 2: Stop by my office (AMB 176) and say hello. If I'm not there, just slide a note under my door saying you stopped by. (Due by 4PM on Friday, January 20)
  • Homework 3: Complete Problems 1-4 from the Problem Collection. (Due Friday, January 20)
  • Homework 4: Complete Problems 5-8 from the Problem Collection. (Due Monday, January 23)
  • Homework 5: Complete Problems 9-11 from the Problem Collection. (Due Wednesday, January 25)
  • Homework 6: Complete Problems 12-14 from the Problem Collection In addition, revisit Problem 7 and attempt to justify why the answer cannot be 10 or larger. (Due Friday, January 27)
  • Homework 7: Complete Problems 15-17 from the Problem Collection. (Due Monday, January 30)
  • Homework 8: Complete Problems 18-20 from the Problem Collection. (Due Friday, February 3)
  • Homework 9: Revisit Problem 20 and find a way to find fastest 3 horses in 7 races and then find a convincing argument that you can't do it in 5 or 6 races. Also, verify that Michael's proposed solution to the problem involving $x-y=85$ and $\sqrt{x}+\sqrt{y}=17$ that was encountered on Friday last week is unique or find the rest of the solutions. Lastly, complete Problem 21 from the Problem Collection. (Due Wednesday, February 8)
  • Homework 10: Complete Problems 22-24 from the Problem Collection. (Due Friday, February 10)
  • Homework 11: Complete Problems 25-28 from the Problem Collection. (Due Monday, February 13)
  • Homework 12: Complete Problems 33-35 from the Problem Collection. Also, attempt to verify that 17 minutes is the minimum in Problem 26. (Due Friday, February 17)
  • Homework 13: Revisit Problem 35 and then complete Problems 36 and 37 from the Problem Collection. For Problem 36, try to sort out whether we can determine the counterfeit coin in at most 3 weighings when we have 1 through 11 coins. (Due Monday, February 20)
  • Homework 14: Complete Problems 38-40 from the Problem Collection. (Due Wednesday, February 22)

Dana C. Ernst

Mathematics & Teaching

  Northern Arizona University
  Flagstaff, AZ
  Google Scholar
  Impact Story

Current Courses

  MAT 220: Math Reasoning
  MAT 320: Foundations of Math

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