R/R_Δ is separable iff for each object e there exists f in its component and r in the centralizer of R_Λ such that the relative trace tr^f(r) equals the local identity.
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Separability for relative extensions of object unital strongly groupoid graded rings
R/R_Δ is separable iff for each object e there exists f in its component and r in the centralizer of R_Λ such that the relative trace tr^f(r) equals the local identity.