Webd(x;y) := sup n2N jx n y nj= (0 8n2N;x n= y n 1 9n2N;x n6= y = (0 x= y 1 x6= y; which is the discrete metric on X. Problem 3. Let (X;d) be a metric space and let 0 < <1. Prove that the ... d(a;b): (5) Show that dist is not a metric on the power set of X. Proof. Although dist is nonnegative and symmetric, it doesn’t satisfy the other WebFrom d ( x, y) + d ( y, z) ≥ d ( x, z), we have φ ( d ( x, y) + d ( y, z)) ≥ φ ( d ( x, z)). So it suffices to show φ ( d ( x, y)) + φ ( d ( y, z)) ≥ φ ( d ( x, y) + d ( y, z)). It suffices to show φ ( a) + φ ( …
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WebHence, d(x) = d(y) and so all degrees are the same. 5.Show that for any directed graph G = (V(G);E(G)), P v2V (G) d +(v) = jE(G)j= P v2V (G) d (v). Solution: This follows from a token argument where we put tokens on the edges: once from the … WebDec 24, 2024 · STA 711 Week 5 R L Wolpert Theorem 1 (Jensen’s Inequality) Let ϕ be a convex function on R and let X ∈ L1 be integrable. Then ϕ E[X]≤ E ϕ(X) One proof with a nice geometric feel relies on finding a tangent line to the graph of ϕ at the point µ = E[X].To start, note by convexity that for any a < b < c, ϕ(b) lies below the value at x = b of the linear … goldfields aged care
Metrics 2 - University of California, Los Angeles
WebE(XY) = E(X)E(Y). More generally, E[g(X)h(Y)] = E[g(X)]E[h(Y)] holds for any function g and h. That is, the independence of two random variables implies that both the covariance and correlation are zero. But, the converse is not true. Interestingly, it turns out … Webd(x,y)= ˆ 1 if x6= y 0 if x=y ˙. It is clearly symmetric and non-negative with d(x,y)=0if and only if x=y. It remains to establish the triangle inequality d(x,y)≤ d(x,z)+d(z,y). If x=y, then the left hand side is zero and the inequality certainly holds. If x6= y, then the left hand side is equal to 1. Since x6= y, we must have either z6 ... WebIf a b, then ax = b for some x ∈ Z, so cax = cb so (ca)x = (cb) i.e. ca cb. (b) Show that if a b and b c, then a c. If ax = b and by = c with x,y ∈ Z, then (ax)y = c = a(xy) so a c since xy ∈ Z. (c) Show that if a b and a c, then a (mb+nc) for all m,n ∈ Z. If ax = b and ay = c with x,y ∈ Z, then mb+nc = max+nay = a(mx+ny) so a (mb+nc) heacham flooring