A p-block with abelian defect group is inertial if it covers a p-block of a normal subgroup of p-power index with only one irreducible Brauer character orbit.
Aschbacher,Finite Group Theory, Cambridge University Press, Cambridge, (2000)
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Blocks with only one irreducible Brauer character orbit
A p-block with abelian defect group is inertial if it covers a p-block of a normal subgroup of p-power index with only one irreducible Brauer character orbit.