Notation

Numbers

• The natural numbers: N = {0, 1, 2, 3, 4, 5, 6, 7, . . . }
• The integers: Z = {. . . , −3, −2, −1, 0, 1, 2, 3, . . . }
• The rational numbers: Q = { 5 3 , 22 7 , 1.5, 0.125, −7, . . . }
• The real numbers: ℝ = {−1, 0, 1, √ 2, e, π, 4.94 . . . , . . . }
• The complex numbers: C = {−1, 0, 1, i, 1 + i, 2 + 3i, . . . }