CS173: Discrete Structures
Spring 2020, Margaret Fleck
Examinations


Basic examlet instructions


Weekly examlets will be given in class on Thursdays, starting in the third week of classes. There will be two sittings of each exam, one at 9:30 and one at 10:10. The class is divided into two groups, based on the first letter of your last name.

The table below shows which time each group should report.

Before the first examlet, you must read the exam instructions and the exam logistics information. These instructions will NOT be reprinted with each examlet.

The listed chapters and skills are the new skills for each examlet. The examlet will focus on these new skills. However, be aware that you're still expected to remember concepts from earlier in the term.

Study problems should be done before the corresponding examlet. You do not need to turn in your solutions. Write up your answers, as if you planned to turn them in. Then check your work against the annotated solutions. Actually writing up the answers is important, since it forces you to work through the details and practice composing a polished proof.

Additional practice problems may be found on the Exams section of the web pages for previous offerings of this course.

You are encouraged to compare study problem solutions with your classmates, bring them into office hours to consult with course staff, etc. High-level discussion on Piazza is ok, as is discussion of very specific issues and possible bugs. However, significant pieces of solutions should be posted only privately to the course staff.

The information (e.g. skills list, study problem) for each examlet should be viewed as tentative until a week before the examlet date. We don't expect large changes but there might be small ones.


 
Examlet Date Textbook sections Skills list Study Problems 9:30 sitting Examlet Solutions DRES/makeup Solutions
#1: Prerequisites and Logic 6 Feb Chapters 1 and 2
excluding 1.5-1.6
Examlet 1 math prerequisites
logic
Group 1 colored
white
colored
white
DRES
makeups
#2: Number theory 13 Feb Chapters 3 and 4
excluding 4.12-4.14
Examlet 2 proofs
number theory
Group 1 colored
white
colored
white
DRES
makeups
#3: Modular arithmetic
Set theory
20 Feb 4.12-4.14, Chapter 5 Examlet 3 modular arithmetic
set theory
Group 1 colored
white
colored
white
DRES
makeups
#4: Relations 27 Feb Chapter 6 Examlet 4 relations Group 1 colored
white
colored
white
DRES
on-time makeups
#5: Functions 5 March Chapters 7 and 8 Examlet 5 functions Group 1 colored
white
colored
white
DRES
#6: Graphs 12 Mar Chapter 9 Examlet 6 graphs Group 1 This examlet was cancelled in the Great Shutdown
#7: Two-way bounding
Easy Induction
26 Mar 1.5, Chapter 10, 11.1-11.7 Examlet 7 two-way bounding
easy induction
>>Group 2<< This examlet was a mixture of examlet 6 and 7 content long proof solutions
#8: Induction
Recursive Definition
2 Apr Chapters 11 and 12 Examlet 8 unrolling
induction
Group 2 This examlet contained some examlet 7 content. long proof solutions
#9: Trees, Grammars 9 Apr 1.6, Chapter 13
excluding 13.6, 13.7
Examlet 9 tree induction Group 2 Grammar inductions moved to examlet 10. long proof solutions
#10: Big-O
Recursion Trees
16 Apr 13.6, 13.7, Chapter 14 Examlet 10 recursion trees
inequality induction
Group 2 Proofs were grammar inductions plus easily-formatted inequality inductions. long proof solutions
#11: Algorithms, NP 23 Apr Chapters 15, 16 Examlet 11 algorithms Group 2 Exam was entirely autograded. Answers should be visible on moodle.
#12: Contradiction
Collections of Sets
30 April Chapters 17, 18 Examlet 12 contradiction
collections of sets
Group 2 long proof solutions
Final: State Diagrams
Countability
Monday
11 May
7-10pm
Chapters 19, 20 Final examlet state diagrams
countability
See above for
room assignments