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Subspaces intersecting in at most a point

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arxiv 1907.02728 v1 pith:QQQMDPIQ submitted 2019-07-05 math.CO cs.ITmath.IT

classification math.COcs.ITmath.IT
keywords intersectingpointboundcodescongconstantconstructiondimension
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abstract

We improve on the lower bound of the maximum number of planes in $\operatorname{PG}(8,q)\cong\F_q^{9}$ pairwise intersecting in at most a point. In terms of constant dimension codes this leads to $A_q(9,4;3)\ge q^{12}+ 2q^8+2q^7+q^6+2q^5+2q^4-2q^2-2q+1$. This result is obtained via a more general construction strategy, which also yields other improvements.

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