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Old October 10th, 2008, 06:05 PM
watchmath watchmath is offline
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The two unit vectors (that you chose) might be not generators of the subspace even they generate a subspace of dimension 2.

You need to take 2 vectors among the 4 original vectors. Since you know that the subspace has dimension two you can take any two vectors (among 4) for which the two are linearly independent.
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