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Internal coordinates and orthogonality: features of the pseudoinverse of the Eliashevich–Wilsonian B-matrix

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Abstract

It is shown that the system of unit vectors corresponding to the internal coordinates is non-orthogonal generally. The deduction starts with the well-known orthonormality of unit vectors of the Cartesian coordinates. The crucial point of the GDIIS method is discussed regarding a “partially isomorphic” relationship between two vector spaces. Some features of the pseudoinverse of the Eliashevich–Wilsonian matrix B are deduced and discussed: these are analogous to the conditions formulated originally for the elements of the B-matrix.

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Acknowledgments

The authors are grateful to Dr. László Párkányi (Research Centre for Natural Sciences of the Hungarian Academy of Sciences) and to Dr. Lajos László, Dr. Tibor Pasinszki and János Eőri (Eötvös Loránd University, Budapest) for the valuable discussions and help.

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Correspondence to G. Pongor.

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Published as part of the special collection of articles “Festschrift in honour of P. R. Surjan”.

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Kalincsák, F., Pongor, G. Internal coordinates and orthogonality: features of the pseudoinverse of the Eliashevich–Wilsonian B-matrix. Theor Chem Acc 134, 108 (2015). https://doi.org/10.1007/s00214-015-1713-8

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  • DOI: https://doi.org/10.1007/s00214-015-1713-8

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