Signed Difference Sets
Dataset of signed (v,k,lambda)-difference sets in finite groups, distributed as a Jupyter notebook with accompanying code.
A dataset of signed difference sets: subsets {d_1,…,d_k} of a group of order v together with signs s_i in {-1,1} such that D = sum s_i d_i satisfies the difference set equation D D^(-1) = n + lambda*G in the group ring. Unlike the other databases on the site, the data are packaged as a Jupyter notebook (with simple handling code) hosted on GitHub/Zenodo and runnable online via Binder.