Simple-current fusion rules for singlet-algebra modules
Let p∈Z≥2p\in\mathbb{Z}_{\ge 2}p∈Z≥2. For j∈Zj\in\mathbb{Z}j∈Z, let πj\pi_jπj be the irreducible M(1)‾\overline{M(1)}M(1)-module defined in the surrounding construction, and let MtM_tMt denote the corres…