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5 Oct 2022: algebra. 1.2. Show that the following sets of subsets of R all generate the same σ-algebra:(a) {(a,b) : a < b}, (b) {(a,b] : a < b}, (c) {(,b] : b ... 1.9. Let (E,E,µ) be a measure space. Call a subset N E null if N B for some B E withµ(B) = 0.

18 Mar 2021: 1 Unramified up to twist: τ = (ψ ψ, 0) for some characterψ : IK C. ... 4 Irreducible: τ = (r0, 0) where r0 is the restriction of some irreducibleWeil-Deligne representation.

7 Oct 2021: ii) M R n N x S |fn(x)| 6 M. (b) In this case assume that S is a metric space. ... Prove that there is some subinterval [a,b] of [0, 1] with a < b on which f isbounded.

23 Oct 2012: J : z 7 az bcz d. for some complex numbers a, b, c, d with ad bc = 1. ... For which choices of a, b, c, d is this map J aninvolution, that is J 2 = I?

15 Oct 2021: Bj,γ,δ. zγxδ, j = 1,. ,n1,. andc(z,x′) =. γ,δ. cγ,δzγxδ,. where these power series converge if |z| |x′| < s for some small s > 0. ... cγ,δzγxδ,. 4. with these power series converging for |x| |x′| < s for some (possibly smaller) s.

13 Nov 2011: Explain geometrically why this is thecase. 5. (i) Suppose that f : R2 R is such that f/x is continuous in some open ball around (a,b),and f/y exists ... 11. Show that there is a continuous square-root function on some neighbourhood of I in Mn;that is,

13 Oct 2012: Let u =(. ac. ), v =. (bd. )for some integers a, b, c, d with ad bc = 1. ... Show that every vector. w Z Z can be written as mu nv for some integers m and n.

5 Oct 2020: 4. If the map f of Question 3 is a conformal equivalence, show that F(z) = λz µfor some λ C. ... 5. Show that complex tori C/⟨1,τ1⟩ and C/⟨1,τ2⟩ are analytically isomorphic ifand only if τ2 = (aτ1 b)/(cτ1 d), for some matrix ( a bc d ) SL2

15 Jan 2021: some a,b 0. Hence prove that the class group of K is cyclic and find itsorder.

21 May 2005: vary in difficulty but cover some instructive points. 1. For what values of a and b does the system of simultaneous linear equations. ... only if it is nilpotent, that is, αk = 0 for some natural number k.

12 Feb 2018: Xn be independent Poisson random variables, with Xi having parameteriθ for some θ > 0. ... b) For some n > 2, let X1,. ,Xniid Exp(θ). Find a minimal sufficient statistic T, and.

26 Oct 2021: Some more questions. 13. (a) A topological space is said to be second countable if there is a countable family Bof open sets such that every open set is a union ... of some members of B.

7 Oct 2021: algebra. 1.2. Show that the following sets of subsets of R all generate the same σ-algebra:(a) {(a,b) : a < b}, (b) {(a,b] : a < b}, (c) {(,b] : b ... 1.9. Let (E,E,µ) be a measure space. Call a subset N E null if N B for some B E withµ(B) = 0.

2 Feb 2010: Show that f (x) = 0 for allx. 8. Let f : [a, b] R be bounded. ... 13. Let f : R R be a function which has the intermediate value property: If f (a) < c < f (b),then f (x) = c for some x between a and b.

14 Feb 2017: 6. Let (An : n N) be a sequence of events in some probability space (,F,P). ... Set. A = {ω : ω An infinitely often}, B = {ω : ω An for all sufficiently large n}.

19 Oct 2020: ii) M R n N x S |fn(x)| 6 M. (b) In this case assume that S is a metric space. ... Prove that there is some subinterval [a,b] of [0, 1] with a < b on which f isbounded.

21 May 2005: Is ittrue that for some c in [a,b] we have. 1. ... i) Suppose that λ > 0. Show that there is some interval [c,d] in [a,b] with the property that.

16 Aug 2011: larger family Aand then randomly discard some of the sets in A to form a subfamily B. ... Then A = vf (W )Xfor some W U , X X W2 YW and W X B.

18 Jan 2021: Proof. Let f : J0(N) A be the quotient map. There exists a mapg : A J0(N) such that fg = [n] for some n > 0. ... and for a given f, it’s possible that some Vf,p are of the form (trivial) (cyclotomic) while others aren’t.

15 Feb 2016: Could there be some other Euclidean function φ making Z[3] into a Euclidean domain? ... iii) Show that if R is a PID, the gcd of elements a and b exists and can be written as rasbfor some r,s R.

23 Jan 2019: As described above, by a theorem of Borel[Bor74] the maps (3.1) are isomorphisms, so ch4kd(ξH) is equal to some poly-nomial p(σ1,σ2,. , ... Hi(B; Q) 0.Now s(τc)|E = 0 so (τc)|E = u (E)x for some x H|c|d(B; Q).

5 Oct 2020: az b, for some a C and b C. ... conformally equivalent). 9. Define an equivalence relation on C by z w iff z = 2sw for some s Z.Show that the quotient space R = C/ has the natural structure of

15 Oct 2021: g2Zngv. Show that if 2 D(Rn) with supp K for some compact K Rn then. ... u[] =X. g2Agv[],. for some finite set A Zn which depends only on K.

14 Oct 2020: δ is abelian.(c) Assume that δ(g) = 1 for some g G. ... irreducible. 3 Find an example of a representation of some finite group over some field of charac-teristic p, which is not completely reducible.

9 Mar 2020: some a,b 0. Hence prove that the class group of K is cyclic and find itsorder.

14 Oct 2008: Show thatf(x) = x for some x S1. 3. Which of the letters A,B,. ... 1,1) π1(S1,f(1)) when. (a) f(eiθ) = ei(θπ/2). (b) f(eiθ) = einθ for some n Z.

11 Nov 2016: u(0,x) =1. 1 x2. 1. 5. (Cauchy-Kovalevskaya Theorem for systems of ODEs) Suppose b > 0 and F : u0 (b,b)d Rd bereal analytic in a neighbourhood of ... u′(t) = F(t,u(t)), u(0) = u0 Rd,. on (a,a) for some a > 0 with u((a,a)) u0 (b,b)d.

10 Oct 2020: algebra. 1.2. Show that the following sets of subsets of R all generate the same σ-algebra:(a) {(a,b) : a < b}, (b) {(a,b] : a < b}, (c) {(,b] : b ... 1.9. Let (E,E,µ) be a measure space. Call a subset N E null if N B for some B E withµ(B) = 0.

9 Feb 2016: 5. Let f be a function on a set A and let B A. ... some c (a,b) the vectors(f(b),g(b). )(f(a),g(a). )and. (f ′(c),g′(c). )in R2.

5 Jun 2020: This makes a direct comparison possible and enables us topresent some theoretical results. ... There exists some number K such that k(n) < K for all n.

11 Feb 2015: Fi //. Ep //. p. B. {b0} // B B. and show using the naturality of the Serre spectral sequence that the compositions. ... for some monic polynomial p(x) with coefficients in H(B; Z). Homotopy Theory Example sheet 3.

23 Dec 2010: Byuniqueness, we can call x = t(R). Lemma 20. Any x V is t(R) for some R B. ... B,b] to an SPG [Q,q]. 28. By Lemma 23, there is a bijection θ : Dom Q ι5“H for some H M.

28 Oct 2021: Some more questions. 13. (a) A topological space is said to be second countable if there is a countable family Bof open sets such that every open set is a union ... of some members of B.

4 Mar 2020: Z. Rn. eix eiy2. ||2sd 6 Cn, |x y|2. b) Show that if s = n2 k for some k 2 Z>0, 0 < < 1, then. ... for some 2 R if and only if:. w(x) = Hk1(x1) Hkn(xn)e12 |x|.

22 Jan 2022: 1. 6. Let (An : n N) be a sequence of events in some probability space (,F,P). ... Recall that (1 1/x)x e. as x. ]. Extensions. Some of the following questions have a more puzzle-like quality.

19 Jan 2010: Show thatf(x) = x for some x S1. 3. Which of the letters A,B,. ... 1,1) π1(S1,f(1)) when. (a) f(eiθ) = ei(θπ/2). (b) f(eiθ) = einθ for some n Z.

21 May 2005: χ(z w) χ(z) χ(w). Remark for readers of Ahlfors or Jones & Singerman: their σ and ζ are not quite the sameas ψ and χ, but for some constants ... 9. (i) Prove Schwartz lemma: if f : is holomorphic and f(0) = 0 then either|f(z)| < |z|, for every z ,

22 Oct 2018: C/Λ2 are conformally equivalent if and only if thelattices are related by Λ2 = λΛ1 for some λ C. ... 5. Show that complex tori C/〈1,τ1〉 and C/〈1,τ2〉 are analytically isomorphic if and only if τ2 =. (aτ1 b)/(cτ1 d), for some matrix(a bc d

22 Oct 2019: 8. Let fn, n N, and f be real-valued continuous functions on the closed bounded interval[a, b]. ... Prove that there is some subinterval [a, b] of [0, 1] with a < b on which f isbounded.

5 Nov 2019: Assume that for some K > 0 we have ‖ϕ(t, x) ϕ(t, y)‖ 6 K‖xy‖ forall t [a, b] and all x, y BR(y0). ... Assume further that. sup{‖ϕ(t, x)‖ : t [a, b], x BR(y0).

19 Mar 2008: only if U = Y V for some V open in (X, dX ).(ii Show that A is closed in (Y, dY ) if and only if A = Y B for some B ... a contraction? Deduce that the differential equation. dy. dx= 2xy , with y = 1 when x = 0 ,. has a unique solution in some interval

8 Mar 2022: Find the probability densityfunction of the radius of the circle. Have you seen this distribution before for some value of λ? ... TN aNbN. , for some aN,bN. (b) Let αN = bN/3c and βN = b2N/3c.

25 Nov 2023: Some more questions. 15. Show that the direct sum A B of C-algebras A and B is a C-algebra withcoordinate-wise operations and with ‖(x,y)‖ = max. ... norm ‖‖. Let ‖‖1 be some (possibly incomplete) algebra-normon A. Show that ‖f‖6 ‖f‖1

1 Feb 2022: Z. Rn. eix eiy2. ||2sd 6 Cn, |x y|2. b) Show that if s = n2 k for some k 2 Z>0, 0 < < 1, then. ... for some 2 R if and only if:. w(x) = cHk1(x1) Hkn(xn)e12 |x|.

20 Oct 2007: f(z) =a(z z0) bc(z z0) d. ,. for some a,b,c,d,z0 C. ... 1 < |z| < 2}, {0 < |z| < 1}, {0 < |z| < }. 8. (i) Let R and S be some Riemann surfaces, f : R S a continuous map, and p a pointin R.

18 Feb 2016: f(x) = limx. g(x) = 0. Assume that for some c > 0, we have g′(x) 6= 0 for all x > c and that f′(x)g′(x). ... Show thatif f ′(a) < y < f ′(b) for some a < b in I and y R, then there exists x I witha < x < b and f ′(x) = y.

7 Feb 2012: Show that f (x) = 0 for allx. 8. Let f : [a, b] R be bounded. ... 13. Let f : R R be a function which has the intermediate value property: If f (a) < c < f (b),then f (x) = c for some x between a and b.

15 Feb 2011: Show that f (x) = 0 for allx. 8. Let f : [a, b] R be bounded. ... 13. Let f : R R be a function which has the intermediate value property: If f (a) < c < f (b),then f (x) = c for some x between a and b.

25 Oct 2023: Proofs for some results inTopics in Analysis. T. W. Körner. October 25, 2023. ... Now P(z) = 0 if and only if z = ajfor some 1 j m.

25 Aug 2021: We refer to [VW11], [HP17], and[LT20] for some special cases of this result. ... If α = αv′ for some v′ {v}, then we define d(α,v) = d(v′).