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GEOMETRY AND GROUPS – Example Sheet 2TKC Michaelmas 2006 ...
https://www.dpmms.cam.ac.uk/study/II/Geometry%2BGroups/2006-2007/Exercise2.pdf8 Nov 2006: 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? -
Geometric group theoryExample sheet 1 Lent 2023 Questions marked ...
https://www.dpmms.cam.ac.uk/files/study/III/GeometricGroupTheory/2022-2023/2023%20GGT%20Sheet%201.pdf16 Feb 2023: 5. Consider the (2,3)-Baumslag–Solitar group BS(2, 3) = 〈a,b | ba2b1a3〉. ... You may use the simplicial approximation theoremwithout proof.]. (b) By considering the preimage of the midpoint of I in the disc, provethat some term ai or bi of g is -
ANALYSIS II—EXAMPLES 1 Mich. 2014 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2014-2015/14sheet1.pdf20 Oct 2014: 4. Let (fn) be a sequence of real-valued continuous functions on a closed, bounded interval [a,b], and. ... a) If Dn is the set of discontinuities of fn and D is the set of discontinuities of f, show that D n=1j=nDj.(b) Suppose that for some finite -
GEOMETRY AND GROUPS – Example Sheet 1TKC Lent 2010 ...
https://www.dpmms.cam.ac.uk/study/II/Geometry%2BGroups/2009-2010/Exercise1.pdf4 Feb 2010: Let u =(. ac. ), v =. (bd. )for some integers a, b, c, d with ad bc = 1. ... Show that every vector. v Z Z can be written as mu nv for some integers m and n. -
GEOMETRY AND GROUPS — Example Sheet 1TKC Michaelmas 2006 ...
https://www.dpmms.cam.ac.uk/study/II/Geometry%2BGroups/2006-2007/Exercise1.pdf8 Nov 2006: Let u =(. ac. ), v =. (bd. )for some integers a, b, c, d with ad bc = 1. ... Show that every vector. v Z Z can be written as mu nv for some integers m and n. -
STATISTICAL MODELLING Part IIC / Michaelmas 2023Example Sheet 4 ...
https://www.dpmms.cam.ac.uk/study/II/StatisticalModelling/2023-2024/ExampleSheet4.pdf27 Nov 2023: ni=1. µ̂i =. ni=1. Yi. 2. Suppose that for some strictly increasing function f, we have. ... for some β that you should specify. (b) How can we estimate β from the data (Yi, xi)ni=1? -
ANALYSIS II (Michaelmas 2010): EXAMPLES 3 The questions are ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2010-2011/anII_ex_2010_3.pdf19 Nov 2010: 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 at (a,b). ... 11. Show that there is a continuous square-root function on some neighbourhood of I in Mn;that is, show that there is an open ball B(I; -
ANALYSIS II—EXAMPLES 4 Mich. 2015 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2015-2016/15sheet4.pdf30 Nov 2015: for some constant Kand an open subset U of Rm containing a, |F(t,x) F(t,y)| K‖xy‖ for all t [0, 1],x,y U. ... for some K and all t [a,b], x,y BR(x0).We showed in lecture that for each t0 [a,b], there is a unique f C([a,b]; -
ANALYSIS II—EXAMPLES 1 Mich. 2015 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2015-2016/15sheet1.pdf16 Oct 2015: 5. Let (fn) be a sequence of real-valued continuous functions on a closed, bounded interval [a,b], and. ... a) If Dn is the set of discontinuities of fn and D is the set of discontinuities of f, show that D n=1j=nDj.(b) Suppose that for some finite -
Why do we need the real numbers?
https://www.dpmms.cam.ac.uk/~wtg10/reals.html3 Sep 2003: What does that mean? Well, if f(x)=u and f(y)=v and z=axby for some a,b> 0 with ab=1 then f(z) ought to be close ... there must be some c between a and b such that f(c)=w. -
Lent Term 2024 O. Randal-Williams IB Groups, Rings, and ...
https://www.dpmms.cam.ac.uk/study/IB/GroupsRings%2BModules/2023-2024/Sheet3.pdf15 Jan 2024: 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. -
ANALYSIS II—EXAMPLES 3 Mich. 2018 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2018-2019/18sheet3.pdf13 Nov 2018: Eo = {x X : B(x) E for some > 0}. ... 8. Use the Contraction Mapping Theorem to show that the equation cos x = x has a unique real solution.Find this solution to some reasonable accuracy using a calculator (remember to -
ANALYSIS II—EXAMPLES 4 Mich. 2018 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2018-2019/18sheet4.pdf23 Nov 2018: Suppose thatsup. [a,b]BR(x0)‖F‖ R(b a)1 and that ‖F(t,x) F(t,y)‖ K‖x y‖ for some. ... 9. (Some useful properties of the operator norm). Recall that the operator norm on the. -
Metric and Topological Spaces Easter 2016 Example Sheet 2 ...
https://www.dpmms.cam.ac.uk/study/IB/MetricTopologicalSpaces/2015-2016/MetTop_2016_Ex2.pdf16 May 2016: 7. (a) If f : [0, 1] [0, 1] is continuous, show there is some x [0, 1] withf(x) = x. ... For eachinteger n > 1, show that there is some x [0, 1] with f(x) = f(x 1. -
1 Metric & Topological Spaces, sheet 2: (2006) 1. ...
https://www.dpmms.cam.ac.uk/study/IB/MetricTopologicalSpaces/2005-2006/2006sheet2.pdf4 May 2006: Prove in this case thata map f from the unit interval [0, 1] to B may be “lifted” to E: there is some g : [0, 1] Esuch that p g = f. ... c) From above, we know (x, P ) Cl(Γ) for some x X. -
ANALYSIS II—EXAMPLES 3 Mich. 2015 Please email comments, corrections…
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2015-2016/15sheet3.pdf13 Nov 2015: Eo = {x X : B(x) E for some > 0}. ... 8. Use the Contraction Mapping Theorem to show that the equation cos x = x has a unique real solution.Find this solution to some reasonable accuracy using a calculator (remember to -
ANALYSIS II—EXAMPLES 3 Mich. 2014 The questions marked with ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2014-2015/14sheet3.pdf21 Nov 2014: Eo = {x X : B(x) E for some > 0}. ... and that. E = {x X : xn x for some sequence (xn) in E}. -
Metric and Topological Spaces Easter 2015 Example Sheet 2 ...
https://www.dpmms.cam.ac.uk/study/IB/MetricTopologicalSpaces/2014-2015/MetTop_2015_Ex2.pdf31 Aug 2015: 7. (a) If f : [0, 1] [0, 1] is continuous, show there is some x [0, 1] withf(x) = x. ... For eachinteger n > 1, show that there is some x [0, 1] with f(x) = f(x 1. -
Erdös-Rado without choice Thomas ForsterCentre for Mathematical…
https://www.dpmms.cam.ac.uk/~tef10/erdosrado.pdf11 Mar 2007: ordering <a—which is initialised to <K. We use a to discard some orderedpairs. ... abbreviate to <<a. We will weed out some ordered pairs from <<a to obtain<a. -
ANALYSIS II—EXAMPLES 4 Mich. 2014 The questions marked with ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2014-2015/14sheet4revised.pdf27 Feb 2015: for some constant Kand an open subset U of Rm containing a, |F(t,x) F(t,y)| K‖xy‖ for all t [0, 1],x,y U. ... E is of the form (a,b), [a,b), (a,b] or [a,b] for some a,b with a b. -
1 Geometry & Groups, 2014 – Sheet 3 1. ...
https://www.dpmms.cam.ac.uk/study/II/Geometry%2BGroups/2013-2014/G+G-2014-Sheet3.pdf17 Feb 2014: iv) Identify the quotient space H2/〈A,B〉. [If you know some algebraictopology, prove directly that the quotient space has fundamental group afree group of rank 2.] If G′ is the ... Deduce that traces of all words in A and B and theirinverses (i.e. -
Oscar Randal-Williams DPMMSCentre for Mathematical…
https://www.dpmms.cam.ac.uk/~or257/CV.pdf15 May 2024: O. Randal-Williams, Some phenomena in tautological rings of manifolds.Selecta Mathematica 24 (4) (2018) 3835-3873. ... Abelianisations of the mapping class groups of some highly-connected manifolds – Rice,Houston, 17th February 2014. -
Ordinals and Ordinal Hierarchies
https://www.dpmms.cam.ac.uk/~wtg10/ordinals.html10 Sep 2002: It has complexity w. 2. if after the first move the game has complexity awb for some a,b. ... x. for some x in X, and the map x goes to t. -
Tensor products
https://www.dpmms.cam.ac.uk/~wtg10/tensors3.html14 May 2003: Just so that we don't have to keep writing the phrase considered as a function on B', let us invent some notation. ... i. ,w. i. ), for some unknown bilinear function f, determined the value of f(v,w). -
Percolation Abstracts
https://www.dpmms.cam.ac.uk/~rb812/abstracts.pdf23 Jul 2023: In this talk, we will discuss some prospecting on how to userotation invariance to obtain new information on the critical random cluster models on Z2. ... Howdoes the answer depend on A,B,C? What if there are more than two species, with some -
ON MODULAR UNITS A. J. Scholl Introduction. In [6], ...
https://www.dpmms.cam.ac.uk/~ajs1005/preprints/u.pdf29 Jan 2010: It isthen clear that for some non-zero invariant v Vq the mapping Φq,1 is given by. ... may be represented by some k GẐ, and then. σ : ZQDf Nf k 7 ZQDẐNf k. -
ANALYSIS II EXAMPLES 4 Michaelmas 2005 J. M. E. ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2005-2006/an05-4.pdf22 Nov 2005: 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 ... dy. dx= 2xy , with y = 1 when x = 0 ,. has a unique solution in some interval containing 0. In what interval can the differential -
ANALYSIS II EXAMPLES 4 Michaelmas 2004 J. M. E. ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2004-2005/an04-4.pdf21 May 2005: 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 ... dy. dx= 2xy , with y = 1 when x = 0 ,. has a unique solution in some interval containing 0. In what interval can the differential -
ANALYSIS II (Michaelmas 2010): EXAMPLES 4 The questions are ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2010-2011/anII_ex_2010_4.pdf29 Nov 2010: Find this solution to some reasonable accuracy using a pocket calculator or thecalculator on your computer (remember to work in radians!), and justify the claimed accuracy ofyour approximation. ... norm. Show, however, that T is a contraction under the -
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 ... 1. 2. 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. -
Extensions of motives and higher Chow groups A. J. ...
https://www.dpmms.cam.ac.uk/~ajs1005/preprints/chow.pdf29 Jan 2010: The second is to. construct some extensions of motives related to elements of higher Chow groups and to. ... as in 1 is probably known to some experts (see for example the penultimate paragraph of. -
ON SOME `-ADIC REPRESENTATIONS OF Gal(Q/Q)ATTACHED TO NONCONGRUENCE…
https://www.dpmms.cam.ac.uk/~ajs1005/preprints/galois-pre.pdf13 Oct 2006: ON SOME -ADIC REPRESENTATIONS OF Gal(Q/Q)ATTACHED TO NONCONGRUENCE SUBGROUPS. A. J. ... Therefore for some a, b Z, azHT b is asemisimple element of g with exactly 2 eigenvalues. -
Mich. 2007 ANALYSIS II—EXAMPLES 4 PAR 1. At which ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2007-2008/sheet4.pdf21 Nov 2007: a) Suppose that D1f exists and is continuous in some open ball around (a, b), and that D2f exists at (a, b). ... Show that f is differentiable at (a, b). (b) Suppose instead that D1f exists and is bounded on some open ball around (a, b), and that for -
TOPICS IN SET THEORY: Example Sheet 1 1 Department ...
https://www.dpmms.cam.ac.uk/study/III/2014-15/TopicsinSetTheory/TST%20Example%20Sheet%201%202014.pdf19 Dec 2014: by some real r ;(b) 20 < ω. ... Let a = min{| A |: A is an infinite maximalalmost disjoint family of subsets of ω}, b = min{| B |: B is unbounded in (ωω,)},and d = min{| D |: D is dominating in ( -
The Pleasures of Counting
https://www.dpmms.cam.ac.uk/~twk10/my-book.html17 Aug 1998: 10. Some classic algorithms 11. Some modern algorithms 12. Deeper matters. ... Sources, Appendix C. Some notations. 540 pp., 67 line diagrams, 170 exercises. -
Cahiers du Centre de logiqueVolume 17 The Paris-Harrington Theoremin…
https://www.dpmms.cam.ac.uk/~tef10/parisharringtontalk.pdf5 Nov 2009: b) to illustrate some of the ways in which P-H is stronger than FiniteRamsey (tho’ the proof of independence from PA is not covered);. ... So, for some large j, consider the initialsegment consisting of the first j elements of X. -
The fundamental theorem of arithmetic not always true.
https://www.dpmms.cam.ac.uk/~wtg10/meta.fta.html11 May 2001: If, however, I can construct some other mathematical object (the model) with those properties for which the theorem is false, then it is clear that my proof cannot work. ... However, in any context in which the lemma applies there has to be some notion -
Relaxing stratification Thomas ForsterDPMMS, CMS Wilberforce…
https://www.dpmms.cam.ac.uk/~tef10/relaxing.pdf29 Mar 2011: In some cases we have felt obliged to supply more than one proof toallay suspicions. ... The next formula needs some explanation! Like (7) it is a stratified formula,with ‘u’ free, and it says that there are two external isomorphisms between〈A,A〉 -
One-step refutations using bombs
https://www.dpmms.cam.ac.uk/~tef10/cam_only/langs-and-automata/1-4-1.html13 Aug 2009: some as followed by some bs and then some as again (and then some bs). ... We will show that will accept some strings that aren't palindromes, and therefore doesn't recognise {a. -
Mich. 2008 ANALYSIS II—EXAMPLES 4 PAR 1. Show that ...
https://www.dpmms.cam.ac.uk/study/IB/AnalysisII/2008-2009/08sheet4.pdf30 Nov 2008: Find the Taylor series of g(I H) about I. 9. Let f : R2 R and (a, b) R2.(a) Suppose that D1f exists and is continuous in some open ball ... around (a, b), and that D2f exists at (a, b).Show that f is differentiable at (a, b).(b) Suppose instead that D1f -
TOPICS IN SET THEORY: Example Sheet 3 1 Department ...
https://www.dpmms.cam.ac.uk/study/III/2014-15/TopicsinSetTheory/TST%20Example%20Sheet%203%202014.pdf19 Dec 2014: P(I) : Y X} for some Y P(I) ; otherwise F isnon-principal. ... Prove thatthe following are equivalent:. 5. (a) h is one-to-one on some club C of δ ;(b) h is strictly increasing on some club D of δ ;(c) -
Continuity and sequences I
https://www.dpmms.cam.ac.uk/~wtg10/easyanalysis3.html7 Aug 2002: some consequence of (ii) and (iii) without really knowing where it was going. ... Earlier we promised to choose b at some point. Clearly it should be chosen to be a. -
Families Intersecting on an Interval
https://www.dpmms.cam.ac.uk/~par31/preprints/intersections-abs.html23 Mar 2007: Fix some subset B of [n]. How large a family A of subsets of [n] can we find such that the intersection of any two sets in A contains a cyclic ... Chung, Graham, Frankl and Shearer have proved that, in the case where B is a block of length t, we can do -
Mich. 2023 ANALYSIS AND TOPOLOGY—EXAMPLES 4 PAR 1. Let ...
https://www.dpmms.cam.ac.uk/~par31/at/4.pdf21 Nov 2023: 10. Let f: R2 R and (a,b) R2. (a) Suppose that D1f exists and is continuous in some open ball around (a,b), and that. ... b) Suppose instead that D1f exists and is bounded on some open ball around (a,b), and. -
Arden's rule and some stuff like that
https://www.dpmms.cam.ac.uk/~tef10/cam_only/langs-and-automata/2-3.html13 Aug 2009: 2.3 Arden's rule and some stuff like that. B I G H O L E H E R E. -
Lent 2024 Number Fields – Example Sheet 3 P.P. ...
https://www.dpmms.cam.ac.uk/~pv270/example3.pdf8 Mar 2024: 2(1. 71). Find an element of OK with norm 2a 3b 5 for some. ... a,b 0. Hence prove that the class group of K is cyclic and find its order. -
The Thought-experiment
https://www.dpmms.cam.ac.uk/~tef10/cam_only/langs-and-automata/1-2.html13 Aug 2009: Let us try some examples. Let L be the set of strings over the alphabet {a, b} which have the same number of as as bs. ... a. n. b. n. : n } This is the language of strings consisting of any number of as followed by the same number of bs. -
ANALYSIS OF FUNCTIONS EXAMPLE SHEET 4Richard Nickl 〈rn289@cam.ac.uk〉…
https://www.dpmms.cam.ac.uk/study/II/AnalysisofFunctions/2023-2024/example4-RN.pdf7 Mar 2024: space. What if 𝑠 1/2? Exercise 6. a) Suppose 𝑠 = 𝑛2 𝛾 for some 0 < 𝛾 < 1. ... ANALYSIS OF FUNCTIONS EXAMPLE SHEET 4. b) Show that if 𝑠 = 𝑛2 𝑘 𝛾 for some 𝑘 Z>0, 0 < 𝛾 < 1, then. -
Mirror symmetry and the SYZ conjecture
https://www.dpmms.cam.ac.uk/~mg475/current.pdf16 Jul 2014: that the transition functions ψi ψ1j are in factaffine linear transformations v 7 Tv v0 for some T GL(Λ) andv0 V. ... This conjecture remains unproven other than some verystraightforward cases (abelian varieties, K3 surfaces).However, it has led to a -
Languages Recognised by Machines
https://www.dpmms.cam.ac.uk/~tef10/cam_only/langs-and-automata/1-1.html13 Aug 2009: Let's have some examples. Let Σ be the alphabet {a, b}. ... Some of them apply here, and we will respect them. We tend to use letters from near the beginning of the alphabet, a, b,.
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