Journal of Formalized Mathematics
Volume 14, 2002
University of Bialystok
Copyright (c) 2002
Association of Mizar Users
On the General Position of Special Polygons
-
Mariusz Giero
-
University of Bialystok
Summary.
-
In this paper we introduce the notion of general position.
We also show some auxiliary theorems for proving Jordan curve
theorem. The following main theorems are proved:
\begin{enumerate}
\item End points of a polygon are in the same component
of a complement of another polygon if number of common points
of these polygons is even;
\item Two points of polygon $L$ are in the same component
of a complement of polygon $M$ if two points of polygon $M$
are in the same component of polygon $L.$
\end{enumerate}
This work has been partially supported by CALCULEMUS
grant HPRN-CT-2000-00102.
The terminology and notation used in this paper have been
introduced in the following articles
[22]
[25]
[19]
[2]
[17]
[21]
[15]
[26]
[1]
[7]
[5]
[3]
[24]
[10]
[4]
[20]
[18]
[8]
[9]
[13]
[14]
[11]
[12]
[16]
[23]
[6]
-
Preliminaries
-
The Notion of General Position and Its Properties
-
Properties of Being in the Same Component of a Complement of a Polygon
-
Cells Are Convex
-
Properties of Points Lying on the Same Line
-
The Position of the Points of a Polygon with Respect to Another Polygon
Acknowledgments
I would like to thank Prof. Andrzej Trybulec for his help
in preparation of this article. I also thank
Adam Grabowski, Robert Milewski and Adam Naumowicz
for their helpful comments.
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Received May 27, 2002
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