Example: bankruptcy
MATH 304 Linear Algebra Lecture 13: Span. Spanning set.
subspace of V if and only if S is nonempty and closed under linear operations, i.e., x,y ∈ S =⇒ x+y ∈ S, x ∈ S =⇒ rx ∈ S for all r ∈ R. Remarks. The zero vector in a subspace is the same as the zero vector in V. Also, the subtraction in a subspace agrees with that in V.
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