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19 Jan 2021: a) Show that there is a surjection π1Sg G, for some g.(b) Show that G is a subgroup of Mod(Sh), for some h. ... a) Prove that TαTβ(α) = β. (b) Prove the braid relation: TαTβTα = TβTαTβ.

6 Feb 2021: Prove that f is continuous on (a,b). Must it be continuous at a andb too? ... 13. Let f : R R be a function which has the intermediate value property: Iff(a) < c < f(b), then f(x) = c for some x between a and b.

4 Feb 2021: BBB = {x : (B B)(x B)}. (a) Let B P() and C P(). ... B C) (BB. B) (CC. C). (b) This part seems to have caused problems for some.

15 Oct 2021: V 0[|E|2 |B|2. ] V µTµ0[F ]. 1. 4V 0. [|E|2 |B|2. ... T(X,Y ) = TσµνXµY νeσ. for some Crfunctions Tσµν := eσ [T(eµ,eν)].

8 Nov 2021: Show that H is normal in G if and only if H is a unionof some conjugacy classes of G. ... 1. |G|gG|Fix(g)|. Deduce that if G acts transitively and |X| > 1, then there is some g G with no xed point.How many distinct ways are there to

16 Mar 2021: F i //. Ep //. p. B. {b0} // B B. ... for some monic polynomial p(x) H(B; Z)[x]. Homotopy Theory Example sheet 3.

15 Oct 2021: 0. for some ai. 2 R. Show that there is a unique f : R! ... Show that:f(x) = g(x) p. k1(x). for some polynomial pk1 of order k 1.

26 Apr 2021: I hope you were not expecting to do it by induction on a or b!),However, one needs to take some thought. ... But of course GCD(a b, b) = GCD(a, b) so we get.

10 Nov 2021: a) All words w {0, 1} consisting of either the string 01 repeated some number oftimes (possibly none), or the string 010 repeated some number of times (possiblynone). ... b) All words w {a, b, c} consisting of some number of a’s (possibly none),

15 Oct 2021: i) If x S, then there exists some B β with x B.ii) If B1, B2 β, then for every x B1 B2 there exists B β with:. ... x B B B1 B2. b) Conversely, suppose that one is given a set S and a collection β of subsets of Ssatisfying i), ii) above.

8 Jan 2021: After allT might prove φ(a) for every a in Γ and yet prove φ(b) for some constant bnot in Γ. ... We need some definitions. DEFINITION 4. A theory T is Γn-complete iff whenever φ(x1,.

15 Oct 2021: for some b > 0, and invoke. the contraction mapping principle]. ...  CbT(1 T) ||w v||X. for some constant C depending on b but not T.

6 Feb 2021: Prove that f is continuous on (a,b). Must it be continuous at a andb too? ... 13. Let f : R R be a function which has the intermediate value property: Iff(a) < c < f(b), then f(x) = c for some x between a and b.

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

20 Jan 2021: 6. Let (An : n N) be a sequence of events in some probability space (, F, P). ... P(Xn = 0) 12π. h. (b) Show further that, for all x R,.

15 Oct 2021: Show that ifeb|k|. f̂(k) 2 L2(R) for some b > 0 then f is real analytic at each point in R. ... B to mean that there exists a universal constant C such that A  CB.

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.

15 Oct 2021: Show that f and g have the same splitting field if andonly if b = cmar for some c K and r N with gcd(r,m) = 1. ... Deduce that every finite abelian group is the Galois group of some Galois extensionK/Q.

15 Oct 2021: for some a < b. ... Lu = u in I, u(a) = u(b) = 0, (?). for some 2 R. Show that the Wronskian:. W(x) = p(x)u0(x)ũ(x) u(x)ũ0(x).

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.