By D M Brink; G R Satchler

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24). Nonetheless, the evolution operator can be represented formally. We set t = tn and divide the interval (to, tn) into n equal subintervals labeled by instants tl = to + Zflt. Here flt = (t n - to)/n. If flt is small enough, the Hamiltonian is essentially time independent in the interval (tl - flt, tl), so that we can write We have neglected terms of order (flt)2. But we have Neglected terms vanish as flt ~ 0, that is, as n ~ 00. 52). 7 Commuting Operators Let A be a Hermitian operator corresponding to some dynamical variable.

Example In the space C5 , two operators represented by the following matrices make up a minimal complete set of commuting operators. 8 Direct Sum of Vector Spaces Let VI and V 2 be two vector spaces of dimensions NI and N 2 • Suppose that scalar products have been defined in VI and V 2 • Let {lui(l)), i = 1, 2, ... , Nd be an orthonormal basis of VI and let {IVk(2)), k = 1, 2, ... , N 2 } be an orthonormal basis of V 2 . The direct sum of VI and V 2 , denoted by VI EB V 2, is the vector space of dimension NI + N2 defined by stipulating that {IUi(l)), IVk(2))} makes up an orthonormal basis of VI EB V 2 .

24) . 25) Note also that the matrix corresponding to a product of linear operators is the matrix product of the matrices that correspond to each operator. Ui)(Uj! Ui)(Ui!. 27) is called a closure relation. ' It is interesting to see how the matrix elements of a linear operator transform when we go from one orthonormal basis to another. 29). The transformation rule for vector components involves a summation on the second index of the matrix elements, whereas the transformation rule for basis vectors involves a summation on the first index.