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## Homework Statement

Find all subspaces of the vector spaces: (ℝ+,.) , (ℝ^2 +,.) , (ℝ^3 +,.)

## The Attempt at a Solution

For ℝ the only subspace i can think of is {0}

For ℝ^2 if found {0} R^2 itself and any set of the form L=cu for u≠0.

For ℝ^3 if found those of R^2 plus R^3 . Are they correct?