libwignernj is a new open-source library for exact evaluation of Wigner symbols, Clebsch-Gordan coefficients, and Gaunt coefficients using prime-factorization and exact rational arithmetic with multi-language bindings.
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A derivation of the Obara-Saika vertical recurrence for Gaussian ERIs is obtained solely from differential relations among basis functions, producing a hierarchical organization of the recursion.
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libwignernj: a reusable C/C++/Fortran/Python library for exact Wigner symbols and related coefficients
libwignernj is a new open-source library for exact evaluation of Wigner symbols, Clebsch-Gordan coefficients, and Gaunt coefficients using prime-factorization and exact rational arithmetic with multi-language bindings.