Go to Downloads. This new version includes (functions are in bold): Further bug fixes Compatible with Mathematica 13 SpinPermutationGroup and related features Handling of arbitrary spin permutation groups SpinPermutationOperators are now represented symbolically following cycle notation Products of SpinPermutationOperators are now evaluated symbolically following cycle notation SymmetryAdaptedBasis Construction of symmetry-adapted spin states for …
Erroneous results have been reported when using SpinDynamica v3.6.x with Mathematica version 13. This is very surprising behaviour since Mathematica should be backwards compatible. This has been pinned down to a surprising inconsistency in the handling of SparseArray objects between Mathematica versions 12 and 13. A bug report has been submitted to wolfram.com. SpinDynamica v3.7 …