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27 Feb 2020: B. t+ u B = B u η2B. Supposing that the velocity retains purely the form of a linear shear flow, u = Sx ey,show that the induction equation has solutions in ... Verify that B B = 0 for this solution, and confirm that the magnetic field has noinfluence

20 Feb 2020: Now use the vector identity. (A B) = B A A B A( B) B( A).

13 May 2020: where x0 and y0 are real constants and A and B are complex constants. ... u. t+ u u = Φ 1. ρΠ. 1. µ0ρB B ,. B. t+ u B = B u ,. u = B = 0 ,. where Π = p |B|22µ0. ]. Part III, Paper 321 [TURN OVER].

13 Apr 2020: One can verifythat the block matrix. [A A#B. A#B B. ]is positive semidefinite since[. ... A A#BA#B B. ]=. [A1/2. A1/2(A1/2BA1/2)1/2. ][A1/2. A1/2(A1/2BA1/2)1/2. ] 0. Other changes The wrong expression for

10 Mar 2020: If x is a solution then it minimises. f(x) := ‖Axb‖2 = 〈Axb, Axb〉 = x>A>Ax 2x>A>b b>b. ... Hence f(x) = 0. But 12f(x) = A>AxA>b, hence A>(Axb) = 0.

12 May 2020: Then for any x wehave. (f1 f2)(x) = f1(x) f2(x). (The right-hand side is the Minkowski sum of sets A B = {a b : a A,b B}).

5 May 2020: Also one cancheck that (F1 F2)(u) = F1(u) F2(u) where the latter is the Minkowski addition of sets (i.e.,A B = {a b : a A,b B}). ... minxRn. ‖Ax b‖22 λ‖x‖1. (8). where A Rmn and b Rm.

2 Mar 2020: Such a matrix is called sparse and efficient solution ofAx = b should exploit sparsity. ... Since thecolumns of A are assumed linearly independent, b 6= 0 and we set q2 = b/‖b‖, hence q1 and q2 are orthonormal.Moreover,.

21 Oct 2020: Thus, the linear system Au = b can be written explicitlyin the block form. ... 25 / 28. Splitting of inhomogeneous systems. Note that our analysis should accommodate b = b(t ), sinceboundary conditions might vary in time!

4 Mar 2020: Since thecolumns of A are assumed linearly independent, b 6= 0 and we set q2 = b/‖b‖, hence q1 and q2 are orthonormal.Moreover,. ... This can be accomplished by multiplying the givenvector, e.g., the right-hand side b if we are solving a linear system

13 May 2020: where x0 and y0 are arbitrary real constants and A and B are arbitrarycomplex constants. ... 1. 220(Br cos 0t Bi sin 0t). 2. =1. 220|B|2,. as required.

26 Oct 2020: Notethat our analysis should accommodate b = b(t), since boundary conditions might vary in time! ... when b is a linear combination of polynomial andexponential terms. For example, b(t) b = const yields.

16 Nov 2020: Specifically, instead of letting(A B )x(k1) = B x(k) b, we let. ... We can convert the above system to the symmetricand positive definite setting by defining A = BT B , b = BT c andthen solving Ax = b with the conjugate gradient algorithm (orany other

2 Feb 2020: If AZ is sufficiently small, such that B is almost constant in Z over that distance, say B = B(X), then /z’AzB dZ = AZ B = B’, say. ... However c(u) is, to first order, i r e (u) where ei is the commutator [A’, B’] = A’B’ - B’A’ (e.g.,.

12 Nov 2020: We can convert the above system to the symmetricand positive definite setting by defining A = BT B, b = BT c andthen solving Ax = b with the conjugate gradient algorithm (orany other ... 1) Set k = 0, x(0) = 0, r(0) = b, and d(0) = r(0);.

22 Oct 2020: µ0. E B. Calculer. P à l'aide de la relation :. (A. B). =B. (. A)A. (. B),. 3. Sachant que la puissance électromagnétique qui traverse une surface (S) fermée est. ... b) Retrouver par intégration la surface d'un demi-disque de rayon R.

30 Jun 2020: We can compute the Hamiltonian,. H =. Zd3x iȦi L. =. Zd3x 12. E E 12 B B A0(r E) (6.17). So A0 acts as a Lagrange multiplier which imposes Gauss’ ... LMaxwell =. Zd3x. 12̇A2 12 B. 2 e2. 2. Zd3x0. j0(x)j0(x 0).

11 Nov 2020: A natural choice is symmetric. gauge. A = 1. 2x B =. B. 2(y, x, 0) (1.18). This choice of gauge breaks translational symmetry in both the x and the y ... 2l 1) = 2n2. Now we add a magnetic field B = (0, 0, B).

28 Jan 2020: 5 –. For ‘ordinary’ (i.e., purely bosonic) vector spaces A and B, there is an exchange operation. ... for any a A and b B. This symmetry operator works the same way for Z2-graded spacesas for standard vector spaces, and can be used to define

5 Oct 2020: of type c. It doesn’t matter which order we fuse anyons, so a?b = b?a or, equivalently,. ... a b c. d. i=X. j. (F dabc. )ij. a b c.