By Cochran T.

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The *frequency of the oscillations is equal to ω/2π. angular measure There are two principal ways of measuring angles: by using *degrees, in more elementary work, and by using *radians, essential in more advanced work, in particular, when calculus is involved. 46 angular momentum Suppose that the particle P of mass m has position vector r and is moving with velocity v. Then the angular momentum L of P about the point A with position vector rA is the vector defined by L = (r − rA) × mv. It is the *moment of the *linear momentum about the point A.

V) A ∪ A = A and A ∩ A = A. (vi) A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C) and A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C), the distributive properties. (vii) A ∪ A′ = E and A ∩ A′ = Ø. (viii) E′ = Ø and Ø′ = E. (ix) (A′)′ = A. (x) (A ∪ B)′ = A′ ∩ B′ and (A ∩ B)′ = A′ ∪ B′, De Morgan’s laws. 36 The application of these laws to subsets of E is known as the algebra of sets. Despite some similarities with the algebra of numbers, there are important and striking differences. algebraic closure The extension of a given set to include all the roots of polynomials with coefficients in the given set.

Argand diagram = COMPLEX PLANE. Argand, Jean Robert (1768–1822) Swiss-born mathematician who was one of several people, including Gauss, who invented a geometrical representation for complex numbers. This explains the name Argand diagram. 62 argument Suppose that the *complex number z is represented by the point P in the *complex plane. The argument of z, denoted by arg z, is the angle θ (in radians) that OP makes with the positive real axis Ox, with the angle given a positive sense anticlockwise from Ox.