Let A = {4, 5, 6} and B = {5, 6, 7} and define relations R,
S, and T from A to B as follows:
For all (x, y) ∈ A × B,
(x, y) ∈ R means that x ≥ y.
(x, y) ∈ S means that
x − y/ 2
is an integer.
T = {(4, 7), (6, 5), (6, 7)}.
a. Draw arrow diagrams for R, S, and T .
b. Indicate whether any of the relations R, S, and T are
functions.

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Do you know what the notation `(x, y) ∈ A × B` means?

yes

coordinates that belong to the cross section of A and b

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