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Mich. 2023 ANALYSIS AND TOPOLOGY—EXAMPLES 1 PAR 1. Let ...
https://www.dpmms.cam.ac.uk/~par31/at/1.pdf12 Oct 2023: Mich. 2023 ANALYSIS AND TOPOLOGY—EXAMPLES 1 PAR. 1. Let (zn) be a sequence in R2 such that zn a and zn b. ... On the other hand, show that if fn does not converge uniformly to f thenwe can find a convergent sequence xm x in [a, b] such that fn(xn) 6 -
la20231.dvi
https://www.dpmms.cam.ac.uk/study/II/LinearAnalysis/2023-2024/la20231.pdf11 Oct 2023: Let A and B be subspaces of a vector space V such that V = A B, and let ‖.‖1and. ... Construct two normed spaces X and Y such that d(X, Y ) = 1 but X and Y are not. -
COMPUTER SCIENCE TRIPOS Part IA 2019 Paper 2 Question ...
https://www.dpmms.cam.ac.uk/~tef10/cam_only/2019p2q5.pdf21 May 2023: Using (a) and (b), or otherwise, show that for all pairs of positive naturalnumbers ⟨m, n⟩, there is a natural number h such that ⟨m, n⟩ ⟨h, h⟩. -
Michaelmas Term 2023-24 Numbers and Sets: Examples Sheet 4 ...
https://www.dpmms.cam.ac.uk/study/IA/Numbers%2BSets/2023-2024/numset4_2023.pdf16 Nov 2023: 13. Let S be a collection of subsets of N such that for every A,B S we have A B or B A.Can S be uncountable? ... Is there an uncountable collection T of subsets of N such that A B isfinite for all distinct A,B T? -
Mich. 2023 ANALYSIS AND TOPOLOGY—EXAMPLES 1 PAR 1. Let ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisandTopology/2023-2024/1.pdf12 Oct 2023: Mich. 2023 ANALYSIS AND TOPOLOGY—EXAMPLES 1 PAR. 1. Let (zn) be a sequence in R2 such that zn a and zn b. ... On the other hand, show that if fn does not converge uniformly to f thenwe can find a convergent sequence xm x in [a, b] such that fn(xn) 6 -
graph20234.dvi
https://www.dpmms.cam.ac.uk/study/II/Graphs/2023-2024/graph20234.pdf20 Sep 2023: Provethat A contains an infinite set B such that no point of B is a convex combination of otherpoints of B. ... Show also that there is a partitionof the vertex-set as X Y such that each of e(X) and e(Y ) is at most 13e(G). -
Complex Analysis Example Sheet 2 Lent 2023 Comments on ...
https://www.dpmms.cam.ac.uk/study/IB/ComplexAnalysis/2022-2023/ExampleSheet2.pdf1 Mar 2023: i) f(z)/z 0 as |z|.(ii) There exists b C and > 0 such that for every z C, |f(z) b| >. (iii) f = u iv and |u(z)| > ... Show that for any b C, there exists a sequence of points zn D(a,R) with zn 6= a such thatzn a and f(zn) b as n. -
Michaelmas Term 2023 T.A. Fisher Galois Theory: Example Sheet ...
https://www.dpmms.cam.ac.uk/~taf1000/galois_theory-23-1.pdf10 Oct 2023: Suppose that α has minimal polynomial f over Q, and let β = α4.Find a, b, c Q such that β = a bα cα2. ... 9. Let K and L be subfields of a field M such that M/K is finite. -
COMPUTER SCIENCE TRIPOS Part IA 2013 Paper 2 Q ...
https://www.dpmms.cam.ac.uk/~tef10/cam_only/2013p2q5.pdf29 May 2023: you definedisjoint union operationally by describing what it does, by giving a spec; youimplement it in such a way that it fits the spec). ... And we have to cook up such a function using only f, a and b. -
Michaelmas Term 2023 T.A. Fisher Galois Theory: Example Sheet ...
https://www.dpmms.cam.ac.uk/~taf1000/galois_theory-23-4.pdf21 Nov 2023: Let a,b K such that the polynomials f = Xm a, g = Xm b are irreducible. ... Use asuitable Lagrange resolvent to find a Q(ζ3) such that K = Q(ζ3, 3. -
Michaelmas Term 2023 Number Theory: Example Sheet 1 of ...
https://www.dpmms.cam.ac.uk/study/II/NumberTheory/2023-2024/number_theory-23-1.pdf27 Oct 2023: Calculate d = (a, b) and find integers r and s such that ra sb = d when. ... iii) Find constants c and d such that λ(a, b) c log b d. -
Complex Analysis Example Sheet 1 Lent 2023 Comments on ...
https://www.dpmms.cam.ac.uk/study/IB/ComplexAnalysis/2022-2023/ExampleSheet1.pdf31 Jan 2023: Regarding T as a map from C into C, show that there existunique complex numbers A, B such that for every z C, T(z) = Az Bz. ... Can such a map be the restriction tothe strip of a Möbius map? -
IB GEOMETRY EXAMPLES 1 G.P. Paternain Lent 2023 Comments ...
https://www.dpmms.cam.ac.uk/~gpp24/Geo_1_23.pdf4 Feb 2023: a) Construct a continuous surjection p : T2 T2 from the torus to itself such that for every x T2, p1(x)consists of exactly two points, and such that p is ... Such a map is calleda covering map.]. (b) Show that T2 also admits a covering map p̂ : T2 K to -
Automata & Formal LanguagesMichaelmas Term 2023 Part II of ...
https://www.dpmms.cam.ac.uk/study/II/AutomataAndFormalLanguages/2023-2024/M23_AFL_ES4.pdf24 Nov 2023: 45) Show that there is a w such that Ww = {w} and a w such that |Ww| = |w|. ... Show that the following sets arecomputably enumerable:. (a) {w ; there are three distinct words v such that f(w, v)};(b) {w ; there is a word v of even length such -
ANALYSIS I EXAMPLES 2 C. M. Warnick Lent 2023 ...
https://www.dpmms.cam.ac.uk/study/IA/AnalysisI/2022-2023/aI_2_23.pdf3 Feb 2023: 3. Let f,g : R R be such that f(x) as x a and g(y) k as y. ... Construct a function f : R R that takes every value on every interval – in otherwords for every a < b and every c there is an x with a < x < b such -
Mich 2023 FUNCTIONAL ANALYSIS – EXAMPLES 2 AZ 1. ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-sheet2.pdf28 Oct 2023: functionf : (X,w) [0, 1] such that f(p) = 1 and f = 0 on C. ... Showthat (K,M,µ1) is the completion of (K,B,µ). 19. Let X be a real or complex vector space with a topology such that addition, scalarmultiplication are continuous, and -
Stochastic Financial Models Michael TehranchiExample sheet 1 -…
https://www.dpmms.cam.ac.uk/study/II/FinancialModels/2023-2024/example1.pdf10 Oct 2023: b) Now let X and Y be jointly Gaussian random vectors such that Cov(X) is positivedefinite. ... Let Q bethe equivalent probability measure such that dQ. dP eX. -
Stochastic Financial Models Michael TehranchiExample sheet 2 -…
https://www.dpmms.cam.ac.uk/study/II/FinancialModels/2023-2024/example2.pdf10 Oct 2023: n such that Ax = 0.• There exists a y Rm with (AT y)i 0 for all i = 1,. , ... Make this assumption for the rest of the problem.(b) Why must there exist an equivalent measure Q such that 1. -
Mich 2023 FUNCTIONAL ANALYSIS – EXAMPLES 1 AZ 1. ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-sheet1.pdf7 Oct 2023: g : C such that |g| = 1 |ν|-a.e. and |ν|(A) =Ag dν for all A F. ... Recall thatµ and ν2 are said to be orthogonal if there is a measurable partition = AB such thatµ(B) = |ν2|(A) = 0.]. -
Mich 2023 FUNCTIONAL ANALYSIS – EXAMPLES 3 AZ 1. ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-sheet3.pdf14 Nov 2023: Show that spanwB =. (B). for B X.Deduce that a w-closed subspace Y of X is a dual space: there is a normedspace Z such that Y = Z. ... Note that such a linear map is bounded.) Show that forT B(X,Y ) the following are all equivalent to T being weakly -
SS (ss2871@maths.cam.ac.uk) Michaelmas 2023 Probability and Measure 1 …
https://www.dpmms.cam.ac.uk/study/II/Probability%2BMeasure/2023-2024/ex1.pdf11 Oct 2023: 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 ... an,bn] such that the Lebesgue measure of A4B(= (Ac B) (ABc)) is less than ε. -
Example sheet 1 Example sheet 1 Problem 1. Show ...
https://www.dpmms.cam.ac.uk/study/IB/Optimization/2022-2023/example1_easter23.pdf17 Jul 2023: a) Show that the unique minimizer is x = 0. (b) Find constants 0 < m < M and L > 0 such that m f ′′(x) M and |f ′′′(x)| L for all x. ... Given constants b1, b2 such that b1 eb2 0 use the Lagrangian method to. -
ANALYSIS I EXAMPLES 4 C. M. Warnick Lent 2023 ...
https://www.dpmms.cam.ac.uk/study/IA/AnalysisI/2022-2023/Analysis%20Sheet%204.pdf8 Mar 2023: Does 10f exist? 3. Give an example of a continuous function f : [0,) [0,), such that0f. ... Must f vanishidentically?[We say g vanishes near a and b if there exists > 0 such that g(x) = 0 for x 6(a ,b ).]. 1. 2 ANALYSIS I EXAMPLES 4. -
Michaelmas Term 2023 Julian Sahasrabudhe Linear Algebra: Example…
https://www.dpmms.cam.ac.uk/study/IB/LinearAlgebra/2023-2024/lin-alg-ex4-2023.pdf24 Nov 2023: If A is the matrix of the first of these (say), find a non-singular matrix P such that PT AP is diagonalwith entries 1. ... an be real numbers such that a1 an = 0 and a21 a2n = 1. -
Michaelmas Term 2023 Julian Sahasrabudhe Linear Algebra: Example…
https://www.dpmms.cam.ac.uk/study/IB/LinearAlgebra/2023-2024/lin-alg-ex3-2023.pdf8 Nov 2023: 12. (a) Show that if x ̸= y are vectors in the finite dimensional vector space V , then there is a linear func-tional θ V such that θ(x) ̸= ... Let A, B V. Prove that A B if and only if Ao Bo.Show that A = V if and only if Ao = {0}. -
IB GEOMETRY EXAMPLES 1 G.P. Paternain Lent 2023 Comments ...
https://www.dpmms.cam.ac.uk/study/IB/Geometry/2022-2023/Geo_1_23.pdf6 Feb 2023: a) Construct a continuous surjection p : T2 T2 from the torus to itself such that for every x T2, p1(x)consists of exactly two points, and such that p is ... Such a map is calleda covering map.]. (b) Show that T2 also admits a covering map p̂ : T2 K to -
@let@token Dynamical Black Hole Entropy
https://www.dpmms.cam.ac.uk/~rbdt2/NAGR/NAGR_07_Wald.pdf9 Nov 2023: SC =2π. κ. C. [Q[ξ] ξ BH]. However, it is not possible for θ to be of the form of a totalvariation δBH on H in general because such a ... M =. [Q[t] t B]. and there is no difficulty in obtaining an M that satisfies thedesired relation. -
Automata & Formal LanguagesMichaelmas Term 2023 Part II of ...
https://www.dpmms.cam.ac.uk/study/II/AutomataAndFormalLanguages/2023-2024/M23_AFL_ES2.corrected.pdf23 Oct 2023: Show that:. (a) There is a nondeterministic automaton N with n 1 states such that L(N) = Ln and(b) if D is a deterministic automaton with fewer than 2n states, ... Prove that there is a proper excerpt e of v such that xey L. -
IB GROUPS, RINGS AND MODULES Lent Term 2023Example Sheet ...
https://www.dpmms.cam.ac.uk/study/IB/GroupsRings%2BModules/2022-2023/Example%20sheet%203.pdf24 Jan 2023: 6) Let R be an integral domain. The greatest common divisor (gcd) of non-zero elements aand b in R is an element d in R such that d divides both ... a and b, and if c divides both aand b then c divides d. -
Measure Theory We list here definitions and results from ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-measure-theory.pdf19 Jan 2023: i) is a set;. (ii) F is a σ-field on , i.e., F P() such that. ... 2 Outer measures. 2.1 Given a set , an outer measure on is a function µ : P() [0,]such that. -
Resumé on Hilbert spaces and Spectral Theory 1 Hilbert ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-resume-on-hilbert.pdf19 Jan 2023: A sesquilinear form θ is bounded if there is aconstant C > 0 such that. | ... 1.6 Adjoints For T B(H) there is a unique map T : H H such that〈Tx,y〉 = 〈x,Ty〉 for all x,y H. -
8 Borel functional calculus and spectral theory Throughout H ...
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-spectral-theory.pdf28 Nov 2023: Operator-valued measures. A resolution of the identity of H over K is amap P : B B(H) such that. ... over K. Then there is an isometric, unital -isomorphism Φ of L(P) onto acommutative, unital C-subalgebra of B(H) such that. -
Elliptic Curves and Modularity Jack A. Thorne Abstract We ...
https://www.dpmms.cam.ac.uk/~jat58/EMS.pdf29 Sep 2023: The discriminant = (a, b)=16(4a327b2)is non-zero. Conversely, for any pair (a, b) O2K such that (a, b) , 0, the equation(2.1) defines an elliptic curve. ... ap bp = cp. to the Fermat equation in exponent p; thus a, b, c Z are coprime non-zero -
Michaelmas Term 2023 T.A. Fisher Galois Theory: Example Sheet ...
https://www.dpmms.cam.ac.uk/study/II/Galois/2023-2024/galois_theory-23-1.pdf10 Oct 2023: Suppose that α has minimal polynomial f over Q, and let β = α4.Find a, b, c Q such that β = a bα cα2. ... 9. Let K and L be subfields of a field M such that M/K is finite. -
EQUIVARIANT LINE BUNDLES WITH CONNECTION ON THE p-ADIC UPPER ...
https://www.dpmms.cam.ac.uk/~sjw47/Drinfeld-I.pdf14 Sep 2023: If χ: A B is an algebra homomorphismthen there is b B such that χ(x) = bxb1 for all x A. ... Evidently such a pair is also an element of AutA(M/X/G). (b) Given a group homomorphism σ : G AutA(M/X/G) such that pr1 σ =1G, the restriction -
Part III Functional Analysis András Zsák Michaelmas 2023 Contents…
https://www.dpmms.cam.ac.uk/~az10000/2023-mich-partiii-func-anal-notes.pdf28 Nov 2023: ii) If A is compact and B is closed, then there exists f X such that supA f <infB f. ... An algebra norm on A is a norm ‖‖ on A such that ‖ab‖ 6 ‖a‖‖b‖ for alla,b A. -
Partial Solutions for Exercises inWhere do Numbers Come From? ...
https://www.dpmms.cam.ac.uk/~twk10/Ansnumber.pdf7 Jan 2023: Suppose that b′ > b. Then we know by the rules for N+ that wecan find a c N+ such that b′ = b c. ... If c C then, since g is surjective, we can find b B such that g(b) = cand, since f is surjective we can find a A such that f (a) = -
REPRESENTATION THEORY SIMON WADSLEY Contents Lecture 1 21.…
https://www.dpmms.cam.ac.uk/~sjw47/2023Lectures.pdf29 Nov 2023: 10. )〉. So. R2 =〈(. 10. )〉〈(. 01. )〉is the only such decomposition in this case. ... Ws such that W = sj=1Wj. Thus. V =ri=1. Ui sj=1. -
Proofs for some results inTopics in Analysis T. W. ...
https://www.dpmms.cam.ac.uk/study/II/TopicsinAnalysis/2023-2024/Caesar.pdf25 Oct 2023: Then there is a point y / E such. that B(y,r) E 6= whenever r > 0. ... Since Uj1 isopen we can find a δj1 > 0 with δj1 δj/4 such that B(xj1,δj1) Uj1. -
GLOBAL SECTIONS OF EQUIVARIANT LINE BUNDLES ON THE p-ADIC ...
https://www.dpmms.cam.ac.uk/~sjw47/Drinfeld.pdf20 Dec 2023: Proposition 2.1.1. ([25, Exercise 2F]) For every ring homomorphism φ: A Band element b B such that bφ(a)φ(a)b = φ(δ(a)) for all a A, ... there is a uniquering homomorphism ψ : A[T; δ] B such that ψ|A = φ and ψ(T) = b. -
Topics in Analysis T. W. Körner October 25, 2023 ...
https://www.dpmms.cam.ac.uk/study/II/TopicsinAnalysis/2023-2024/Topic.pdf25 Oct 2023: Theorem 4.2. If f : [a,b] [a,b] is a continuous function, then we canfind a w [a,b] such that f(w) = w. ... Supposethat we can find a a0 < a1 < < an b such that, writing σ = ‖fP‖we have either. -
Generalisations of hyperbolicityReading seminar University of…
https://www.dpmms.cam.ac.uk/~aptm3/docs/maths/2022-GeneralisationsOfHyperbolicity.pdf12 Jan 2023: 20. are constants K,C, such that for all a,b MCG(S),. dMCG(S)(a,b) K,CYS. ... Let (X,S) be a HHS. Thereis a constant T0 > 0 such that for all T T0, there are constants K,C, such that for all a,b X,. -
Number Fields IID, Lent 2020* Comments/corrections to…
https://www.dpmms.cam.ac.uk/~ajs1005/nf2d/number_fields_notes.pdf1 Feb 2023: STP that if0 6= b Qn then Tb 6= 0, or equivalently there exists c Qn such that tcTb 6= 0.But if β =. bjαj, γ =. cjαj then. tcTb = TrK/Q( ... There is an invertiblelinear transformation u: Rn Rn such that u(Λ) = Zn. -
REMARKS ON GLUING PUNCTURED LOGARITHMIC MAPS MARK GROSS Abstract. ...
https://www.dpmms.cam.ac.uk/~mg475/gluing.pdf6 Mar 2023: Logarithmic Gromov-Witten theory defines the notion of a logarithmic stable mapto such targets X B; more generally, this morphism just needs to be toroidal ratherthan normal crossings, i.e., log ... The type of such a family consistsof the data τ := (G, -
MAT 449: Representation theory These lecture notes are in ...
https://www.dpmms.cam.ac.uk/~jcsl5/notes.pdf24 Oct 2023: Vn such that V ' V1 Vn. Theorem 4.12. Suppose that G is finite and |G| 6= 0 in F. ... central character, such that z v = λ(z) v forall z Z(G) and v V. -
INDEPENDENCE OF ` FOR FROBENIUS CONJUGACY CLASSES ATTACHED TO ...
https://www.dpmms.cam.ac.uk/~rz240/l-indep_v2.pdf23 Jan 2023: Suppose there exists a class [b] B(G,{µ}) such that ν[b] = µ(such a class is necessarily unique if it exists by the above remark). ... When G is quasi-split,this class is just [b]µ. However if G is not quasi-split, there may be no [b] B(G,{µ})such -
Michaelmas Term 2023 T.A. Fisher Galois Theory: Example Sheet ...
https://www.dpmms.cam.ac.uk/study/II/Galois/2023-2024/galois_theory-23-4.pdf24 Nov 2023: Let a,b K such that the polynomials f = Xm a, g = Xm b are irreducible. ... Use asuitable Lagrange resolvent to find a Q(ζ3) such that K = Q(ζ3, 3. -
ANALYSIS OF FUNCTIONS EXAMPLE SHEET 1 Roland Bauerschmidt…
https://www.dpmms.cam.ac.uk/study/II/AnalysisofFunctions/2022-2023/example1.pdf7 Feb 2023: b) We say that a measurable 𝑓 : R𝑛 C is in weak-𝐿𝑝(R𝑛), written 𝑓 𝐿𝑝,𝑤 (R𝑛) if there exists aconstant 𝐶 such that. |{ ... Deduce 𝑁𝑖=1. 𝐵𝑖. 6 3𝑛 𝑘︁𝑗=1. 𝐵𝑖𝑗. b) () Suppose {𝐵 𝑗 : 𝑗 -
IA Groups – Example Sheet 1 Michaelmas 2023 hjrw2@cam.ac.uk ...
https://www.dpmms.cam.ac.uk/study/IA/Groups/2023-2024/Groups%20Example%20Sheet%201%202023.pdf5 Oct 2023: Theleast such n is called the order of g.). (b) Show from first principles that there is a positive integer N such that gN = e for all g G. ... 9. Let H and G be groups and let X G such that 〈X〉 = G. -
STATISTICAL MODELLING Part IIC / Michaelmas 2023Example Sheet 1 ...
https://www.dpmms.cam.ac.uk/study/II/StatisticalModelling/2023-2024/ExampleSheet1.pdf27 Nov 2023: X̃1, that is, β̃1 = (X̃T1 X̃1). 1X̃T1 Ỹ. (c) Find a condition on X0 and X1 such that β̃0 = β̂0. ... b) The model is to be reparametrised in such a way that it can be specialised to (i) two parallellines for the two groups, (ii) two lines with
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