초록 close

Null designs on the poset of dual polar spaces are con-sidered. A poset of dual polar spaces is the set of isotropic sub-spaces of a ¯nite vector space equipped with a nondegenerate bilin-ear form, ordered by inclusion. We show that the minimum num-ber of isotropic subspaces to construct a nonzero null t-design is Qti=0(1 + qi) for the types BN, DN, whereas for the case of type CN, more isotropic subspaces are needed.