Abstract. Compact Schur multipliers on the algebra B(H) of all bounded linear operators on an infinite-dimensional separable complex Hilbert space H will be identified as the elements of the Haagerup tensor product c 0 ⊗ h c 0 (the completion of c 0 ⊗ c 0 in the Haagerup norm). Other ideals of Schur multipliers related to compact operators will also be characterized.
The magnetic susceptibility tensor and proton and fluorine magnetic shielding tensors are cal culated for F2 and (FHF)-using an ab initio finite perturbation method with gauge-invariant atomic orbitals (GIAO). The discussion of the basis set deficiency shows that the calculated values for the susceptibilities are reliable. Simple additivity (Pascal rule) for the susceptibility is con firmed.
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