Let S = {1 + t - t^2, 2t - t^2 + t^3, -2 + t^2 + t^3, -3 + t + t^2 + 2t^3} and W be the subspace of...

[s3yoc]

I need help

 

[stapel]

I need help

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[Steven G]

I guess that the operation is addition because the degree is <=3?