Question #196676

Suppose v1,v2, vm is linearly independent in V and w ∈ V . Prove that dim span(v+w,v2+w,..vm+w)≥ m-1


1
Expert's answer
2021-05-24T11:36:07-0400

Let {v1,v2,...,vmv_1,v_2,...,v_m } is linearly independent in V and wW.w\in W.


Suppose (v1w,v2w,...,vmw)(v_1-w,v_2-w,...,v_m-w) is Linearly dependent. Then there esists scalars a1,a2,...,ama_1,a_2,...,a_m , not all zero such that


 a1(v1w),a2(v2w)..,am(vmw)a_1(v_1-w),a_2(v_2-w)..,a_m(v_m-w)


Rearranging the equation-


a1v1+...+amvm=(a1+...+am)wa_1v_1+...+a_mv_m=(a_1+...+a_m)w


If a1+...+ama_1+...+a_m were zero, then the equation above would contradict the linear independence of {v1,v2,...,vmv_1,v_2,...,v_m }. Thus a1+....+am0.a_1+....+a_m\neq 0.


Thus divide both sides of the equation by (a1+...+am)(a_1+...+a_m) showing that wspan(v1,v2,..,vm)w\in span(v_1,v_2,..,v_m)


dim span(v1w,v2w,...,vmw)m1.\Rightarrow \text{dim span}(v_1-w,v_2-w,...,v_m-w)\ge m-1.


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