Download Algebraic Structures and Operator Calculus: Volume III: by Philip Feinsilver, René Schott (auth.) PDF

By Philip Feinsilver, René Schott (auth.)

Introduction I. normal feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 II. Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five III. Lie algebras: a few fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eight bankruptcy 1 Operator calculus and Appell structures I. Boson calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 II. Holomorphic canonical calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 III. Canonical Appell platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 bankruptcy 2 Representations of Lie teams I. Coordinates on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 II. twin representations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 III. Matrix components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 IV. brought on representations and homogeneous areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty normal Appell platforms bankruptcy three I. Convolution and stochastic methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty four II. Stochastic procedures on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty six III. Appell platforms on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty nine bankruptcy four Canonical platforms in numerous variables I. Homogeneous areas and Cartan decompositions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . fifty four II. prompted illustration and coherent states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixty two III. Orthogonal polynomials in numerous variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixty eight bankruptcy five Algebras with discrete spectrum I. Calculus on teams: evaluate of the speculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eighty three II. Finite-difference algebra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eighty five III. q-HW algebra and simple hypergeometric services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 IV. su2 and Krawtchouk polynomials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ninety three V. e2 and Lommel polynomials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a hundred and one bankruptcy 6 Nilpotent and solvable algebras I. Heisenberg algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 II. Type-H Lie algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Vll III. Upper-triangular matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . one hundred twenty five IV. Affine and Euclidean algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 bankruptcy 7 Hermitian symmetric areas I. uncomplicated buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 II. area of oblong matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 III. area of skew-symmetric matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 IV. house of symmetric matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 bankruptcy eight homes of matrix parts I. Addition formulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 II. Recurrences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 III. Quotient representations and summation formulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 bankruptcy nine Symbolic computations I. Computing the pi-matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 II. Adjoint crew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 III. Recursive computation of matrix components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Extra info for Algebraic Structures and Operator Calculus: Volume III: Representations of Lie Groups

Example text

3) n This can be seen directly by multiplying cn(A') by g(A) on the left and by [n] on the right and summing: g(A) L cn(A')[n] = L cn(A') (:) n A [m] m,R while the left-hand side equals g(A)g(A') = g(A 8 A') = L:m cm(A 8 A')[m] as required. 3) can be interpreted as saying that cm(A 8 A') is the generating function for the matrix elements ('::) A. 2 Proposition. The right dual pi-matrices are matrix elements for transitions between basis elements. 2 DIFFERENTIAL RECURRENCES Using the double duals, we can find differential recurrence relations in which the action of the vector fields is expressed in terms of a corresponding action on the discrete indices of the matrix elements.

R;:) A = (c)ncm(A), since the left and right duals commute. we have • Induced representations and homogeneous spaces Homogeneous spaces are quotient spaces, such as cosets of the group modulo a subgroup. Here we have a subalgebra, Q, say, and take a quotient of U(9) mapping the subalgebra to zero or to scalars. This induces a representation of 9, on the reduced basis, and a representation of G as well, giving a homogeneous space with coordinates corresponding to the complement of Q in 9. , the double dual acts on polynomials in R.

X;) 1- ED; The corresponding canonical polynomials T}n( x) are a family of multivariable Bessel polynomials and they are related to the Hermite polynomials in several variables as in Example 2. 2 O-POLYNOMIALS Observe that the canonical polynomials T}n(x), for N = 1, being of the form (xw)n1 always have a common factor of x. Thus, one can define an associated sequence of 0polynomials On(x) = x-I T}n+I(X) In the situation of Example 2 above these give the standard version of the Bessel polynomials.

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