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math.CO2021
A modular equality for -ovoids of elliptic quadrics
Alexander L. Gavrilyuk, Klaus Metsch, Francesco Pavese
An -ovoid of a finite polar space is a set of points such that every maximal subspace of contains exactly points of .…
math.CO2021
Erdös-Ko-Rado sets of flags of finite sets
Klaus Metsch
A flag of a finite set is a set of non-empty proper subsets of such that or for all . The set is called the typ…
math.CO2021
The chromatic number of a two families of generalized Kneser graphs related to finite generalized quadrangles and finite projective 3-spaces
Klaus Metsch
Let be the graph whose vertices are the chambers of the finite projective space with two vertices being adjacent when the corresponding chambers are in general positi…