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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.

19 Jan 2021: for every x X there exists some B B such that x B; and. ... for all B1,B2 B and for all x B1 B2 there exists some B3 B suchthat x B3 B1 B2.

21 May 2021: Problem 8. Given constants b1, b2 such that b1 eb2 0 use the Lagrangian method to. ... Hint: There will be two cases to check depending the constants b1 and b2.].

6 Dec 2021: Exercise 2.4. Let X = {a, b, c} with a, b and c distinct. ... Then B(x, 1/j) isopen, but. j=1 B(x, 1/j) = {x} is not.

15 Oct 2021: Fµν] =. 0 E1 E2 E3E1 0 B3 B2E2 B3 0 B1E3 B2 B1 0. ... V 0[|E|2 |B|2. ] V µTµ0[F ]. 1. 4V 0. [|E|2 |B|2.

18 Jun 2021: If K1, K2are knots in S3, choose balls B1, B2 S3 such that Bi Kiis a single unknotted arc as shown in the figure to the right.Let Yi = S3 ... Let ϕ : B1 B2 be reflection in the verticaldirection of the figure (so ϕ(K1 B1) = K2 B2, but with the

30 Apr 2021: Let a2 β with d (a1,a2) 6 r0, b2 β with d (b1,b2) 6 r0.Consider the path. ... ρ = α|[a0,a1] [a1,a2] β|[a2,b2] [b2,b1] α|[b1,b0]. Then. (ρ) 6 (6λ 4) r0 2λ µ.But exponential divergence (Proposition 1.23) implies that. (

15 Oct 2021: b. 1. ] [a2. , b. 2. ] and set |A| = (b1. ... a1. ) (b2. a2. ). Supposef : A! R, g : A!

8 Aug 2021: 2a b ‖b‖2) (‖a‖2 2a b ‖b‖2)= 2(‖a‖2 ‖b‖2). ... 0 bb 0. ). ,. and det A = b2 6= 0 if A 6= 0.(ii) False.

15 Oct 2021: f(tπ) |π|. Theorem 4.8. Let A = [a1,b1] [a2,b2] and let f : [a,b] R be an integrable function.Suppose ((Pl,τl))l=0 is a sequence of ... A set B A = [a1,b1] [a2,b2] is Jordan measurable if, and only if,B has measure zero.