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27 Nov 2019: 3. The symmetric difference of sets A and B is A B = (A B) (B A). ... 8. Define a relation R on N by setting aRb if a divides b or b divides a.

11 Nov 2019: Define an equivalencerelation between elements (b,h) UαG, (b′,h′) UβG, so that (b,h) (b′,h′) preciselyif b′ = b and h′ = ψβα(b)h. ... point b B is determined by the value s(b) at that point.

25 Nov 2019: b) Use the Mayer–Vietoris sequence to compute the homology of Σg#Sn, andhence deduce that it is homeomorphic to Sn2g. ... Show that the linear map A : R2 R2 preserves the equivalence relation (a,b) (a′,b′) (aa′,b b′) Z2,and so induces a

5 Feb 2019: a) If f is increasing, then f ′(x) 0 for every x (a,b).(b) If f ′(x) 0 for every x (a,b), then f is increasing.(c) If f ... 12. Suppose f : [a,b] R is differentiable, and that f ′(a) < k < f ′(b).

14 Oct 2019: 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 R}. ... 11. Let X = Rd endowed with the σ-algebra B of Borel sets.

2 Nov 2019: Definition. A vector space with a multiplication [, ], bilinear in its arguments (thus satis-fying the distributive law), is called a Lie algebra if the multiplication is anti-commutative[a,b] = ... a] and satisfies the Jacobi identity [[a,b],c] [[b,c],a]

8 Nov 2019: T F(S1). C A. F(S2) B Γ. G. ĩ. j̃. q1. ... as required, and similarly φ l(b) = g(b) for b B.

2 Dec 2019: Note that we’ve already checked that mpBq “ |B|in the first lecture. ... Ş. n En is empty. Proof. (a) write µpBq “ µpBzAq µpAq.(b) write.

25 Nov 2019: From Riesz representation Theorem, there exists T(x′) Hsuch that. 〈x′,T(x)〉B′B = (x | T(x′))H for all x H. ... AB be a converging sequence, then zn = anbn z and by compactness ofA: aφ(n) a implies bφ(n) za b B since B is closed, and hence z