coordinate systems
DESCRIPTION
COORDINATE SYSTEMS. Arbitrary vector spaces are so … i t is not so easy to do any meaningful computa-tion in them. The purpose of introducing Coordinate Systems is twofold: Make an arbitrary vector space look more familiar, e.g. like - PowerPoint PPT PresentationTRANSCRIPT
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Arbitrary vector spaces are so …it is not so easy to do any meaningful computa-tion in them. The purpose of introducing Coordinate Systems is twofold:A. Make an arbitrary vector space look more
familiar, e.g. likeB. Occasionally (determined by context, see
example 3, p. 217) make some computations easier, even in
COORDINATE SYSTEMS
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Let’s start with purpose A. After the smoke clears we will have shown that:“If a vector space V has a basis then V is essentially undistinguishable from We state and prove first the following theorem, (theorem 7, p. 216, called the Unique Representa-tion Theorem.)Theorem. Let the vector space V have basis
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of scalars must exist,
But why should such set of scalars be unique? Well,suppose there were two such sets,
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We can now give the following (p. 216)Definition. Let
called the
The column vector
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The function (mapping)
defined by
Remark. If the column vector
is simply the -coordinate vector of ,
where is the standard basis
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We continue with
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Theorem (8, p. 219) Let V be a vector space with a basis . The coordinate mapping defined by
(An isomorphism, a dictionary between V and .)Proof. Denote the coordinate mapping with
The statement
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. So now let
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and therefore
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for any