The elementary divisors of the incidence matrix of skew lines in 𝑃𝐺(3,𝑞)

Brouwer, Andries; Ducey, Joshua; Sin, Peter

doi:10.1090/S0002-9939-2011-11462-X

The elementary divisors of the incidence matrix of skew lines in $\mathrm {PG}(3,q)$
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by Andries E. Brouwer, Joshua E. Ducey and Peter Sin PDF

Proc. Amer. Math. Soc. 140 (2012), 2561-2573 Request permission

Abstract:

The elementary divisors of the incidence matrix of lines in $\operatorname {PG}(3,q)$ are computed, where two lines are incident if and only if they are skew.

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