A linear combination of vectors u1,u2,…,un\mathbf{u}_1, \mathbf{u}_2, \dots, \mathbf{u}_nu1,u2,…,un with scalars c1,c2,…,cnc_1, c_2, \dots, c_nc1,c2,…,cn is expressed as:
c1u1+c2u2+⋯+cnunc_1 \mathbf{u}_1 + c_2 \mathbf{u}_2 + \dots + c_n \mathbf{u}_nc1u1+c2u2+⋯+cnun
c1u1⋅c2u2⋯⋅cnunc_1 \mathbf{u}_1 \cdot c_2 \mathbf{u}_2 \dots \cdot c_n \mathbf{u}_nc1u1⋅c2u2⋯⋅cnun
(c1+⋯+cn)(u1+⋯+un)(c_1 + \dots + c_n)(\mathbf{u}_1 + \dots + \mathbf{u}_n)(c1+⋯+cn)(u1+⋯+un)
c1u1×c2u2×⋯×cnunc_1 \mathbf{u}_1 \times c_2 \mathbf{u}_2 \times \dots \times c_n \mathbf{u}_nc1u1×c2u2×⋯×cnun