Examples

Notation: V stands for the vector space VM2x2 over R with standard operations, where M2x2 is the collection of 2x2 real matrices.

Example I

(i) W = { margin: 0%; ( a 0 0 b ) : a , bR } is a subspace of V.

CAUTION :

SOLUTION :

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Example II

(ii) W = {2x2 real matrices with integer entries} is not a subspace of V.

CAUTION :

SOLUTION :

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