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17 Jun 2019: Find constantsα and β such that. xjTij = [( B) B]i. ... i) the union of all sets in B is X;. (ii) if x B1 B2 for two sets B1 and B2 in B, then there is a set B B withx

30 Aug 2019: You do notneed to write a complete proof.). (d) Let A = 〈a, a′ | aa′a1(a′)1〉 and let B = 〈b, b′ | bb′b1(b′)1〉 and consider the freeproduct. ... A B = 〈a, a′, b, b′ | aa′a1(a′)1, bb′b1(b′)1〉. Let T be the graph with a

30 Aug 2019: A B| |A B| > |A| |B|. (iii) For A, B P(n), write. ... A B ={. A B : A A, B B}. Show that|A B||B A| > |A||B|.

30 Aug 2019: Bt. ui B = B ui, (3). where ui and un are the velocities of the ions and of the neutral particles, respectively; alldiffusion terms have been neglected; µin is the ... In this approximation, the magnetic field obeys. Bt. = c4πen. [( B) B].

30 Aug 2019: 2 Consider a pressure-balancing magnetic field satisfying. ( B) B = µ0p. ... where B = B(r,θ), p = p(r,θ) in spherical polar co-ordinates (r,θ,φ).

30 Aug 2019: µ0( B) B ,. B. t= (u B) ,. B = 0 ,. 2Φ = 4πGρ. 1. (a) Formulate the equations governing the steady, spherically symmetric, adiabatic flowof an unmagnetized, non-self-gravitating perfect gas in ... form. u = v(z,t) axey , B = B(z,t) , ρ = ρ(z,t) ,.

30 Aug 2019: instructed to do so by the Invigilator. 2. 1 Consider a Parker wave dynamo model for a mean magnetic field B = B(x, t)eφ A(x, t)eφ in the ... Defining A = A Ã(τ ), B = B B̃(τ ), where the overbar indicates an averageover the fast (τ ) timescale,

30 Aug 2019: Π 1. µ0B B,. B. t+ u B = B u,. ... u = 0,. B = 0. Explain the meaning of Π in the first equation, and write down an appropriate setof boundary conditions for this system.

19 Jun 2019: For the particular choice. ψ(x) = min{b, max{x,b}}, b < :. (i) Find the asymptotic variance V (ψ, Φ), where Φ is the standard normal distri-bution;. ... ii) Verify that the estimator is B-robust, by determining an explicit bound on theinfluence

30 Aug 2019: µ0( B) B ,. B. t= (u B) ,. B = 0 ,. 2Φ = 4πGρ. Part III, Paper 314. 3. 1. (a) In magnetohydrodynamics, the cross-helicity contained in a fixed volume V isdefined as. ... The basic state is in magnetostaticequilibrium, with density ρ(z), pressure p(z)