A reminder that HW#4 is due tomorrow (Wed Oct 24). You can find the full list of exercises below (you can also find HW assignments posted at https://openlab.citytech.cuny.edu/mat2440-ganguli-fall2018/assignments/)
Also, we will have a quiz at the end of class tomorrow. The quiz will be similar to HW exercises from Sec 1.7 and Sec 2.1.
HW#4 (due Wed Oct 24):
Sec 1.7: Intro to Proofs (p91):
#1-3 (study Examples 1&2 on p83 carefully; use them as models for your proofs)
#9-11
#17, 18 (instead of giving a proof by contraposition and a proof by contradiction, it will suffice to give a proof by contraposition or a proof by contradiction, i.e., one or the other is fine (but you can interpret this as an inclusive-or, and write out both types of proofs!))
(For the odd-numbered exercises: try to write out a proof on your own before you look at the solutions; then study the solution and use it to edit your proof, if necessary. I will primarily grade the even-numbered exercises, but I will also check your solutions to the odd-numbered exercises; your proofs should be in your own words, i.e., not exactly the same as the textbook solutions!)
Sec 2.1:Sets (p125-126):
#2(a)(b), 6, 7(a)-(d), 8(a)-(d), 12, 14, 19, 20, 21(a)(b), 26, 27, 33, 34, 35, 37
(for #35 & #37, give a brief explanation or draw a diagram to justify your answers)
Sec 2.2: Set Operations (p136):
3, 4, 14, 15(b), 16(a)(b), 23
