Let a = (a, az); b = (b, ,b2) € R?, define the function %3D %3D d: R? x R? ---> R by d=(a, b) = |b,-a, I + do(az, b2), where do denotes the discrete metric on R. Prove that d is a metric on R?
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A: Thanks for the question :)And your upvote will be really appreciable ;)
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- Let X=R2 and let d be the Euclidean metric. Define d3: R2 x R2 to R by d3(x, y) = min{1, d(x, y)} Verify that d3 is a metric on R2Sketch the space curve r(t) = −ti + 4tj + 3tk and find its length over the given interval [0, 1] .Let X=ℝ2 and define d2,:ℝ2×ℝ2→ℝ by d2((x1 ,y1),(x2,y2)) = max{|x1 - x2|,|y1 - y2|}. a) Verify that d2 is a metric on ℝ2. b.) Draw the neighborhood N((0; 1) for d2, where 0 is the origin in ℝ2.
- \(d\) is a metric on \(X\).Show that \(\rho : X^2 \to [0,\infty)\) defined by\[\rho(x,y) = \frac{3d(x,y)}{2 + 3d(x,y)}\]is also a metric on \(XLet (X,d) be a metric space. Define f: X x X -> Real Numbers by f(x,y) = d(x,y) / 1+d(x,y) . show that f is a metric on X.Let (R>0, d) be the metric space defined by d(x, y) =|log (y/x)|. This metric space is isometric to the Euclidean line E1, where an isometry E1 → (R>0, d) is given by x→ ex . proof that x→ ex is isometric.
- consider the metric space < X, d > for the case in which the metric d is the usual metric on R'. Given the closed ball B,(a) C X with centre a = P(3, 1, 1, 1) that is located on its boundary OB. (2,0, 2, 2) and the point (i) Show that every point x 4 Br(a) is the centre of an open ball B:(x) with some feasible radius e > 0, and give the feasible range for ɛ. (ii) Use this to prove that the complement B„(a)° of the close ball is an open set.Suppose a point X lies in the exterior of a disk, and suppose that two lines are drawn from X tangent to the circle. If one line is tangent at Y and the other line is tangent at Z, then show that the line segment XY is congruent to the line segment XZ.Compute (see picture), where vector f = <x2+y, 3x - y2> and C is the (piece-wise smooth) positively oriented boundary curve of a region D with area 6.