One of the most important subjects that the starshaped sets theory concerned withis
specifying the kernel of the starshaped set and vision the points and regions for each other.
So in staircase visibilitytheresearcher Rajeev Motwani proved that the
points of separating
regions with dents cannot see each other. After that Breen could find a way for specifying
the kernel of starshaped orthogonal polygon when this orthogonal polygon is simply
connected.
In this paper we will generalize the previous way when the closed orthogonal
polygon is secondly connected and the bounded component for the complement is union of
three staircase paths, every path consists of more than two edges. We will prove that the
kernel is only one component.
Many mathematicians were interested in specifying the kernel of the starshaped set. In staircase visibility the researcher Rajeev Motwani proved that the points of separating regions with dents cannot see each other, and then he proved that these po
ints are seen from other points of an orthogonal polygon. After that Breen could find a way for specifying the kernel of starshaped orthogonal polygon when this orthogonal polygon is simply connected.
The aim of this paper is to generalize the previous way when the closed orthogonal polygon is secondly connected and the bounded component for the complement contains one staircase path or two staircase paths, every path consists of more than two edges. We will prove that the kernel is either one component or two or three ones.