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Q.Let D be a metric on X determined all constant k s.t
(i) kd is a metric
(ii)(k+d) is a metric
Q.Find all metric on a set X consisting of one point and consisting of two points.
Q. Prove that |d(x,z)-d(y,z)|≤d(x,y)
let f(x) =modulus x^3.Compute f'(x),f"(x),for all real x,and show that f"'(0) does not exist
Q. Show that the real line is a metric space.
Q. Is d(x, y) =√(│x-y│) a metric space?(solve it)
Consider the Cantor-Lebesgue function F : C → R, where C is the Cantor set.
a) Show that F is continuous and actually F can be extended to the whole R so that it is continuous (to do
this, note that if (a, b) is an interval from the complement of C, then F(a) = F(b)).
b) Using (a), show that if f : R → R is continuous function and A is a measurable subset of R, then f(A) may
not be measurable.
c) Show that the inverse image of a measurable set under a continuous function is not always measurable
(compare with Problem 2).
Hint: For (c), notice that F is increasing, thus the function F(x) +x is strictly increasing (and continuous).
Therefore, F(x) + x has a continuous inverse...
Fixing x, show that the Taylor series of e
tx− t
2
2 is given by X∞
n=0
t
nHn(x). (Explain
also why the series converges.)
Show that if A, B ⊆ R^d are closed sets, then A + B is measurable (in fact A + B is an Fσ set). Show, however that A + B may not be closed.
Evaluate ∫∫∫z2dx dydz
S
,where S is the solid region between the spheres ρ =1 and
ρ = 2, by using spherical coordinates.