libwignernj is a library that evaluates standard Wigner symbols and related coefficients exactly to the last floating-point bit by keeping all intermediates as exact rationals using prime-exponent vectors and multiword Racah summation.
Koike, Explicit formulae of angular momentum coupling coefficients, Comput
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libwignernj: a reusable C/C++/Fortran/Python library for exact Wigner symbols and related coefficients
libwignernj is a library that evaluates standard Wigner symbols and related coefficients exactly to the last floating-point bit by keeping all intermediates as exact rationals using prime-exponent vectors and multiword Racah summation.