The question is, "Which relations in Exercise 5 are irreflexive?"
Exercise five being: Determine whether the relation R on the set of all Webpages is reflexive, symmetric, antisymmetric, and/or transitive, where (a, b) ∈ R if and only if
a) everyone who has visited Web page a has also visited Webpage b.
b)there are no common links found on both Webpage a and Web page b.
c) there is at least one common link on Web page a and Webpage b.
d)there is a Web page that includes links to both Webpage a and Web page b.
I thought b,c, and d were irreflexive, but boy was I wrong. It turns out that none of them are irreflexive; I am having a difficult time seeing this, though. I could really use some help working through why they aren't irreflexive, please.