Blocking sets of certain line sets related to a hyperbolic quadric in PG(3, q)

摘要

For a fixed hyperbolic quadric H in P G(3, q), let E (respectively; T, S) denote the set of all lines of P G(3, q) which are external (respectively; tangent, secant) with respect to H. We characterize the minimum size blocking sets of P G(3, q) with respect to each of the line sets S, T U S and E U S.