Graphs with bounded thinness were defined in 2007 as a generalization of interval graphs. In this paper we introduce the concept of proper thinness, such that graphs with bounded proper thinness generalize proper interval ...

Given an arbitrary graph and a proper interval graph with we say that H is a proper interval completion of G. The graph H is called a minimal proper interval completion of G if, for any sandwich graph with , is not a ...

Gaia DR2 five astrometric parameters and magnitude of the proper motion members of the association Cygnus OB2 and of the substructures named 'Right over-density' and 'Left over-density' are presented. For each group the ...

A generally accepted view regarding proper names is that they have reference, but no lexical meaning (Lyons, 1977). This idea is the basis for the Functional Discourse Grammar (Hengeveld & Mackenzie, 2008) view of proper ...

Let E be a Banach space contained in a Hilbert space L. Assume thatthe inclusion is continuous with dense range. Following the terminology of Gohberg andZambicki, we say that a bounded operator on E is a proper operator ...

In this paper we further study the notion of proper costratifying systems, defined in [MPV]. We give sufficient conditions for their existence, and investigate the relation between the stratifying systems defined by K. ...

Given an arbitrary graph G=(V,E) and a proper interval graph H=(V,F) with E ⊆ F we say that H is a proper interval completion of G. The graph H is called a minimal proper interval completion of G if, for any sandwich ...