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these linear combinations is called the span of (v₁,v₂,v₃) and is sometimes just written as Span(v₁,v₂,v₃). The Span of One Vector If I have one single vector in 2-D space (In math terms, ℝ² can be thought of as 2-D space. Likewise, ℝ³ can be thought of 3-D space, and so on), the span would be