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3. Show that the union of two subspaces is a subspace if and only if one contains the other. 4. Suppose that v1, v,.,vk are linearly independent and w ev. Prove that vi,, , w are linearly independent if and only if w f span(vs, v ..,/) 12s
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3) et Assume that is a vector space over field K wi and Wa be any subspace s of v we show k, Лиг is subs Pace of y íf and only A ssume Ui is subs pace o On contrary, suppose W1 W2 and W2 ф here is xeW,W and WW luUW is subs pace of V>xy WUk casecí) : suppose χ+yeh, and new! contradiction +o suppose case(ii): χ+yew2 and yew2 contradiction to x t :. In both eases got contradichion h and Whc, is our assumption wron Co nvexsely, cuppose WiC o WacW, 2 IS Subs pace U s subspace Subspa:. In both coses e got w, UWsubspare 0 Hence union of two subspaces are subspaces aud only if one contains other 4 se V,,V2, -.., Vk are linearly independemt ven and W e V Assume V, Vh To show w e span iv.,Va, -- Yk,Ware linearly independent. on contran* suppose , we span iY,,V, Ve ence we aet scaldTs, «*1 ,2 1., no a zero bu v V-,Vk, W 1 are linearlų dependent, are inearly independent. Contradiction Conversely, assume w span 3vmW2, To shonw V,Y2,V^ s lnearly îndependent suppose , dk+1キ。Contradicon and Vak Yu3 are linearly independent ร์ v, , , vk ,w} ร์ s linearly independent , and en is linearly independent

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