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Let G be a discrete group and 𝒞 be an additive spherical G-fusion category. We prove that the state sum 3-dimensional HQFT derived from 𝒞 is isomorphic to the surgery 3-dimensional HQFT derived from the G-center of 𝒞.
In this paper, we calculate the values of the E6 state sum invariant for the lens spaces L(p, q). In particular, we show that the values of the invariant are determined by p mod 12 and q mod (p, 12). As a corollary, we show that the E6 state sum is a homotopy invariant for the oriented lens spaces.