a) Let R be the relation on the set of all URLs (or Web addresses) such that x Ry if and only
if the Web page at x is the same as the Web page at y. Show that R is an equivalence relation.
b). Let R be the relation on the set of all people who have visited a particular Web page such that
x Ry if and only if person x and person y have followed the same set of links starting at this Web
page (going from Web page to Web page until they stop using the Web). Show that R is an
equivalence relation.