• Ved Prakash Gupta

      Articles written in Proceedings – Mathematical Sciences

    • Planar Algebra of the Subgroup-Subfactor

      Ved Prakash Gupta

      More Details Abstract Fulltext PDF

      We give an identification between the planar algebra of the subgroup-subfactor $R \rtimes H \subset R \rtimes G$ and the 𝐺-invariant planar subalgebra of the planar algebra of the bipartite graph $\star_n$, where $n=[G:H]$. The crucial step in this identification is an exhibition of a model for the basic construction tower, and thereafter of the standard invariant of $R \rtimes H \subset R \rtimes G$ in terms of operator matrices.

      We also obtain an identification between the planar algebra of the fixed algebra subfactor $R^G \subset R^H$ and the 𝐺-invariant planar subalgebra of the planar algebra of the `flip’ of $\star_n$.

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