Chapter 1: Problem 6
Show that the midpoint of the line segment joining the points \((a, b)\) and \((c, d)\) is \(((a+c) / 2,(b+d) / 2)\).
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Chapter 1: Problem 6
Show that the midpoint of the line segment joining the points \((a, b)\) and \((c, d)\) is \(((a+c) / 2,(b+d) / 2)\).
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The vectors \(u_{1}=(1,1,1,1), u_{2}=(0,1,1,1), u_{3}=(0,0,1,1)\), and \(u_{4}=(0,0,0,1)\) form a basis for \(F^{4}\). Find the unique representation of an arbitrary vector \(\left(a_{1}, a_{2}, a_{3}, a_{4}\right)\) in \(\mathrm{F}^{4}\) as a linear combination of \(u_{1}, u_{2}, u_{3}\), and \(u_{4}\).
Show that if \(S_{1}\) and \(S_{2}\) are arbitrary subsets of a vector space V, then $\operatorname{span}\left(S_{1} \cup S_{2}\right)=\operatorname{span}\left(S_{1}\right)+\operatorname{span}\left(S_{2}\right)$. (The sum of two subsets is defined in the exercises of Section 1.3.)
Show that if \(S_{1}\) and \(S_{2}\) are subsets of a vector space \(\mathrm{V}\) such that \(S_{1} \subseteq S_{2}\), then $\operatorname{span}\left(S_{1}\right) \subseteq \operatorname{span}\left(S_{2}\right) .\( In particular, if \)S_{1} \subseteq S_{2}\( and \)\operatorname{span}\left(S_{1}\right)=\mathrm{V}$, deduce that span \(\left(S_{2}\right)=\mathrm{V}\). Visit goo.gl/Fi8Epr for a solution.
Let \(v_{1}, v_{2}, \ldots, v_{k}, v\) be vectors in a vector space \(\mathrm{V}\), and define \(\mathrm{W}_{1}=\) $\operatorname{span}\left(\left\\{v_{1}, v_{2}, \ldots, v_{k}\right\\}\right)$, and $\mathrm{W}_{2}=\operatorname{span}\left(\left\\{v_{1}, v_{2}, \ldots, v_{k}, v\right\\}\right)$. (a) Find necessary and sufficient conditions on \(v\) such that \(\operatorname{dim}\left(\mathrm{W}_{1}\right)=\) \(\operatorname{dim}\left(\mathrm{W}_{2}\right)\). (b) State and prove a relationship involving \(\operatorname{dim}\left(\mathrm{W}_{1}\right)\) and \(\operatorname{dim}\left(\mathrm{W}_{2}\right)\) in the case that $\operatorname{dim}\left(\mathrm{W}_{1}\right) \neq \operatorname{dim}\left(\mathrm{W}_{2}\right)$.
Write \(v=(2,5)\) as a linear combination of \(u_{1}\) and \(u_{2},\) where: (a) \(u_{1}=(1,2)\) and \(u_{2}=(3,5)\) (b) \(u_{1}=(3,-4)\) and \(u_{2}=(2,-3)\)
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