We introduce a systematic mathematical language for describing fixed point models and apply it to the study to topological phases of matter. The framework established is reminiscent to that of state-sum models and lattice topological quantum field theories. but is formalized and unified in terms of tensor networks. In contrast to existing tensor network ansatzes for the study of groun... https://lecoureures.shop/product-category/course-a-pied-homme-vetements-short-9/