The answers to exercises marked [BB] can he found in the Back of the Book.
Suppose A is a subset of N × N with the properties
· (1, 1) ∈ A and
· if (a, b) ∈ A, then both (a + 1, b) and (a + 1, b + 1) are also in A.
Do you think that [(m, n) ∈ N × N | m ≥ n] is a subset of A? Explain. [Hint: A picture of A in the xy-plane might help.]
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