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Vector Space Dimension




We say ''V'' is finite-dimensional if the dimension of ''V'' is .


EXAMPLES


E.g. The vector space R3 has {(1,0,0), (0,1,0), (0,0,1)} as a basis, and therefore we have dimR(R3) = 3. More generally, dimR(R''n'') = ''n''. And more generally still, dim''F''(''F''''n'') = ''n''.

The Complex Number s C are both a real and complex vector space; we have dim'''R'''(C) = 2 and dimC(C) = 1. So the dimension depends on the base field.

The only vector space with dimension 0 is {0}, the vector space consisting only of its zero element.


FACTS


If ''W'' is a Linear Subspace of ''V'', then dim(''W'') ≤ dim(''V'').

To show that two finite-dimensional vector spaces are equal, one often uses the following criterion: if ''V'' is a finite-dimensional vector space and ''W'' is a linear subspace of ''V'' with dim(''W'') = dim(''V''), then ''W'' = ''V''.

  :If Dim''V'' Is Finite, Then ''V'' ''F''<sup>dim''V''</sup>
  :If Dim''V'' Is Infinite, Then ''V'' max(''F'', dim''V'')