The answers to exercises marked [BB] can be found in the Back of the Book.
Define on by (a, b) ∈ if and only if 1 < |ax| + |xy| < 2.
(a) Make a sketch in the Cartesian plane showing the region of R2 defined by .
(b) Show that is neither reflexive nor transitive.
(c) Is symmetric? Is it antisymmetric? Explain.
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