Abelian-symmetric generic Kagome iPESSΒΆ

Specialized sub-class of ipeps.ipeps_kagome_abelian.IPEPS_KAGOME_ABELIAN. A single on-site tensor representing DoFs on down triangle is built from five different tensors: two rank-3 trivalent tensors with only auxiliary indices and three rank-3 bond tensors, each associated to one of the physical DoFs on the vertices of the down triangle.