Question: ( a ) Define S = { x in R 4 | 0 < = xi < = 1 , i = 1 , 2

(a) Define S ={x in R4
|0<= xi <=1, i =1,2,3,4}, and D ={x in R4
|\| x\|4<=1}. Is S \cap D convex? Is S \cup D
convex? Is S \ D convex?

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