Example 5: B(0, t) = {(X1, X2); |X1| < t, |x₂] < t} in (R², ||· ||∞) is an open ball. But {(X1X2, 0): |x₁| < t, |x₂| < t} is not open in (R³, ||· ||∞). So the projection map P: R³ R³. .P(X1, X2, X3) = (x1, x2, 0) is not an open map. Whereas Q : R³ → R². Q(X1, X2, X3) = (x1, x2) is an open map.
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- Fill in blanks with options provided. Describe in words the region of double-struck R3 represented by the inequality. 0 ≤ z ≤ 5 The inequality 0 ≤ z ≤ 5 represents all points ( select one: between/on/on or between) the ( select one: horizontal/vertical) planes z = 0 (the (select one: yz/xy/xz) -plane) and z = 5.Optimal popcorn box A small popcorn box is created from a12" x 12" sheet of paperboard by first cutting out four shadedrectangles, each of length x and width x/2 (see figure). Theremaining paperboard is folded along the solid lines to form abox. What dimensions of the box maximize the volume of the box?Topic is Euclident n-spaceLet x,y,z ∈ Rn , and c ∈ R. Then prove the ff:a. ||x|| >= 0b. ||x|| = 0 <=> x = 0c. ||cx|| = ||c|| · ||x||d. ||x · y|| <= ||x|| · ||y||
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