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Problems forSolid State Physics (3rdYearCourse6) Hilary ...
This technique is know as the molecularorbital approach, or the LCAO (linear combination of atomic orbitals) approach. It is used heavily in numerical simulation of molecules. However, more generally, one cannot assume that the basis set of orbitals is orthonormal. In problem A.2.1. we properly consider a non-orthonormal basis.
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FIRST-ORDER ORDINARY DIFFERENTIAL EQUATIONS
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