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Shashi ranjan sinha
but converse is not true. Take A = { (1,0), (0,1)} and B ={ (-1,0),(0,-1)} . Intersection of A and B is empty and so the subspace spanned by it is zero subspace of R². On the other hand, Span(A) = span(B) = R² and so their intersection is R². clearly R² is not contained in zero space