Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/36
Is Reference of Faisceau de plans passant par une droite-fr#Sense
Vlakkenwaaier-nl#Sense
Fascio di piani concorrenti-it#Sense
Sheaf of collinear planes-en#Sense
Ebenenbueschel-de#Sense
Pencil of planes-en#Sense