Posted by poo on .
7. Classify each of the following as true or false. If false, tell why or give an example showing that it is not true.
(a) For all sets A and B, A – B = B – A
(b) For all sets A, A
(c) For all sets A, A A
(d) The set {r, s, t,. . ., z} is a finite set.
(e) No set can be equivalent to all of its subsets

please repost 
MathMate,
1. Try to post your question in ISO88591 encoding so everyone sees what the special characters are.
2. You can type certain characters related to sets as follows:
"& c u p ;" ∪
"& c a p ;" ∩
"& s u b ;" ⊂
"& i s i n ;" ∈
"& n o t i n ;" ∉
"& e m p t y ;" ∅
"& a n d ;" ∧
"& o r ;" ∨
Do not include the double quotes nor the intervening spaces.