 Solution

ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2022/discrete-mathematics-continuous-mathematics-and-probability/discrete-mathematics/3/c/ii/solution

This binary relation is not an equivalence relation, because it is not symmetric:

(0, 0) R (0, 1)

since

0 \leq 1

, but

(0, 1) R (0, 0)

is false. In fact the injective encoding

(a, b) \mapsto 10 a + b

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