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23 Nov 2020: 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.

5 Jun 2020: 2 f-Regularity. Following [7], we denote for each r 0 and B B,. ... x X and every B B satisfying ψ(B) > 0, there is a constantcB < such that,.

9 Nov 2020: lemma. Since the slope filtration descend to G u(a,b), for a a′ b′ b we have a subquotient over. ... First form the pullbackof. 0 AA B B′ C C 0by the diagonal morphism : C C C′ to get obtain an extension.

4 Mar 2020: µ(Xn,αn)w. nµ{0,1}N. Proof. Fix r0 > 0 and (B,b,β) X{0,1}r0. •,6r0. ... Define. pn = PxXn ((Xn,x) 'r (B,b)) and p = P(Y,y)µ ((Y,y) 'r (B,b)).

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 ... 1.8. Let B be a Borel subset of the interval [0, 1].

5 Jun 2020: ixs xs. Here B B denotes the algebra generated by B and B and xs xs. ... suces to check that. limN. ess sup supA BN. PA j B PA.

23 Nov 2020: 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

11 Nov 2020: We now let µ X(T) and let b G(L) such that [b] B(G,µ). ... Thenumber N (µ,b) depends on b only via its σ-conjugacy class [b] B(G).

5 Jun 2020: d sup. jP B A P BP AjP BP A. A B B Bd. ... d supjP B A P BP Aj A B B Bd.

6 May 2020: d. (p, Im c|[b′,b]. ), there exists p [x,y]. such thatd(p, Im c|[a,a′]. )= ... ii) For all (a,b) , (a′,b′) R, we have |dA (a,a′) dB (b,b′)| ε.