Section 3.3 Partitions
1. Describe the equivalence relation on each of the following sets with the given partition.
(a) N; {{1, 2, ..., 9}, {10, 11, ..., 99}, {100, 101, ..., 999}, ...}.
(b) R; {(-∞, 0), {0}, (0, ∞)}.
(c) N; {{0, 1, 2, 3}, {4, 5, 6, 7}, {8, 9, 10, 11}, ...}.