By G. N. Watson

An Unabridged, Digitally Enlarged Printing, to incorporate: The Tabulation Of Bessel features - Bibliography - Index Of Symbols - record Of Authors Quoted, And A entire Index

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For such an operator we often write Ax instead of A(x). 2. If a linear operator A is continuous at x = 0, it is continuous on the entire space X. This follows immediately from the relation A(x) − A(x0 ) = A(x − x0 ), December 24, 2008 10:59 World Scientific Book - 9in x 6in elasticity 39 Models and Ideas of Classical Mechanics since we can think of x − x0 as a vector y that becomes arbitrarily small when we make x arbitrarily close to x0 . Why is the notion of continuity seldom stressed for matrix operators in linear algebra?

An operator A has a domain D(A) and a range R(A). In this book D(A) will be a subset of a normed space X, while R(A) will lie in a normed space Y (which may coincide with X). The correspondence itself, taking each point x ∈ D(A) into a uniquely defined point y ∈ R(A), will be denoted y = A(x). 9) We say that A acts from X to Y . If Y = X, we say that A acts in X. A mapping A acting from a normed space X to the scalars R or C is called a functional. The branch of mathematics known as functional analysis had its origins in the study of such mappings.

And this leads us to the idea that to describe the motion of bodies, we must introduce other parameters such as the familiar Euler angles α, β, γ. In fact this is the first step toward Lagrangian mechanics. The latter is a consequence of Newtonian mechanics that makes use of generalized coordinates to describe the motion of objects. It simplifies the solution of many problems. 1) as consequences of the dynamic equations for a system of particles. 2) are applied to continuous rigid bodies that occupy volumes or that are idealized as surface or linear mass distributions.