[a,b] closed interval [a,b] = {x | a ≤ x ≤ b} (a,b) open interval (a,b) = {x | a b} i: imaginary unit: i ≡ √-1: z = 3 + 2i: z* complex conjugate: z = a+bi → z*=a-bi: z* = 3 - 2i: z: complex conjugate: z =

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If set A and set B are two sets then the cartesian product of set A and set B is a set of all ordered pairs (a,b), such that a is an element of A and b is an element of B. It is denoted by A × B. We

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a b: power: exponent: 2 4 = 16. period: decimal point, decimal separator: 4.36 = 4 +(36/100) √a: square root: √a · √a = a: √9 = ±3: a^b: caret: exponent: 2 ^ 3 = 8: 4 √a: fourth root: 4 √a · 4 √a · 4