Abstract
By removing the components of at-spread\(S\) of a finite projective spacePG(d, q) from each hyperplane ofPG(d, q), the blocks of a regular group divisible design\(\mathcal{G}(S)\) are obtained We characterize geometrict-spreads as thoset-spreads\(S\) which are such that the dual of\(\mathcal{G}(S)\) is also a group divisible design.
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