Výsledky vyhledávání - "Frédéric Vanhove"

Standardization of torsional CT measurements of the lower limbs with threshold values for corrective osteotomy

Autor: Geert Vanderschueren, Nathalie Noppe, Willem-Jan Metsemakers, Austin T. Fragomen, Harm Hoekstra, Frédéric Vanhove

Publikováno v: Archives of Orthopaedic and Trauma Surgery. 139:795-805

Re-establishing anatomic rotational alignment of shaft fractures of the lower extremities remains challenging. Clinical evaluation in combination with radiological measurements is important in pre- and post-surgical assessment. Based on computed tomo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be765a258a64fa054706db9953ea8b5b
https://doi.org/10.1007/s00402-019-03139-1

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A geometric proof of the upper bound on the size of partial spreads in $H(4n+1,$q2$)$

Autor: Frédéric Vanhove

Publikováno v: Advances in Mathematics of Communications. 5:157-160

We give a geometric proof of the upper bound of q2n+1$+1$ on the size of partial spreads in the polar space $H(4n+1,$q2$)$. This bound is tight and has already been proved in an algebraic way. Our alternative proof also yields a characterization of t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d4a973aeb7f6fa475db100cfaa323a89
https://doi.org/10.3934/amc.2011.5.157

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A Higman inequality for regular near polygons

Autor: Frédéric Vanhove

Publikováno v: Journal of Algebraic Combinatorics. 34:357-373

The inequality of Higman for generalized quadrangles of order (s,t) with s>1 states that t?s 2. We generalize this by proving that the intersection number c i of a regular near 2d-gon of order (s,t) with s>1 satisfies the tight bound c i ?(s 2i ?1)/(

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c1fb2dea0fcb189fa9337b4dcc21f8db
https://doi.org/10.1007/s10801-011-0275-7

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Antidesigns and regularity of partial spreads in dual polar graphs

Autor: Frédéric Vanhove

Publikováno v: JOURNAL OF COMBINATORIAL DESIGNS

We give several examples of designs and antidesigns in classical finite polar spaces. These types of subsets of maximal totally isotropic subspaces generalize the dualization of the concepts of m-ovoids and tight sets of points in generalized quadran

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1bc4c674072d0f31929d6bde657e6a25
https://doi.org/10.1002/jcd.20275

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On Q-polynomial regular near 2d-gons

Autor: Frédéric Vanhove, Bart De Bruyn

Publikováno v: COMBINATORICA

We discuss thick regular near 2d-gons with a Q-polynomial collinearity graph. For da parts per thousand yen4, we show that apart from Hamming near polygons and dual polar spaces there are no thick Q-polynomial regular near polygons. We also show that

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4991187fdea17fde0c186000cc8213e0
https://biblio.ugent.be/publication/7140142

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Constant rank-distance sets of Hermitian matrices and partial spreads in Hermitian polar spaces

Autor: Michel Lavrauw, John Sheekey, Rod Gow, Frédéric Vanhove

Publikováno v: Scopus-Elsevier

In this paper we investigate partial spreads of $H(2n-1,q^2)$ through the related notion of partial spread sets of hermitian matrices, and the more general notion of constant rank-distance sets. We prove a tight upper bound on the maximum size of a l

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dae6658ce8a83fe98402a628ecfce7ab
https://biblio.vub.ac.be/vubir/constant-rankdistance-sets-of-hermitian-matrices-and-partial-spreads-in-hermitian-polar-spaces(7bf96c45-e2fa-4acf-9752-d7c3a69d63f5).html

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Inequalities for regular near polygons, with applications to m-ovoids

Autor: Frédéric Vanhove, Bart De Bruyn

Publikováno v: EUROPEAN JOURNAL OF COMBINATORICS

We derive two sets of inequalities for regular near polygons and study the case where one or more of these inequalities become equalities. This will allow us to obtain two characterization results for dual polar spaces. Our investigation will also ha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::241fc7fb81e95448a004568a090e5bd8
https://hdl.handle.net/1854/LU-3217940

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Theorems of Erdos-Ko-Rado type in polar spaces

Autor: Valentina Pepe, Frédéric Vanhove, Leo Storme

Publikováno v: JOURNAL OF COMBINATORIAL THEORY SERIES A

We consider Erdős–Ko–Rado sets of generators in classical finite polar spaces. These are sets of generators that all intersect non-trivially. We characterize the Erdős–Ko–Rado sets of generators of maximum size in all polar spaces, except f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af39ffb448972fe339a93d3fcee38d5d
https://biblio.ugent.be/publication/1231350/file/1231354

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The Maximum Size of a Partial Spread in $H(4 n +1, q^2)$ is $q^{2 n +1}+1$

Autor: Frédéric Vanhove

Publikováno v: The Electronic Journal of Combinatorics. 16

We prove that in every finite Hermitian polar space of odd dimension and even maximal dimension $\rho$ of the totally isotropic subspaces, a partial spread has size at most $q^{\rho+1}+1$, where $GF(q^2)$ is the defining field. This bound is tight an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dd976246e028fa8e41df3e4d065f4c9f
https://doi.org/10.37236/251

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