ℝ: set name - real numbers, ℂ : set-builder notation - { a + bi : a, b ∈ ℝ}, ℂ : set name - complex numbers, ℚ : set name - rational numbers, ℚ : set-builder notation - { p/q : p, q ∈ ℤ and q ≠ 0 } , ℤ : set name - integers, ℤ : set of elements - { ..., -2, -1, 0, 1, 2, ... }, ℤ : set builder notation - { ± n : n ∈ ℕ } ∪ { 0 }, ℕ : set of elements - { 1, 2, 3, 4, ... }, ℕ : set name - natural numbers, ∅ : set name - empty set, ∅ : set elements - { },

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