From 205b65bcb0891d941b60f295876b40121cfe871e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20M=C3=BCller?= <andreas.mueller@ost.ch>
Date: Sat, 18 Dec 2021 17:17:17 +0100
Subject: more info about gamma function

---
 .../chapters/080-funktionentheorie/images/Makefile |   5 +-
 .../080-funktionentheorie/images/gammapfad.pdf     | Bin 0 -> 14664 bytes
 .../080-funktionentheorie/images/gammapfad.tex     |  54 +++++++++++++++++++++
 3 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 buch/chapters/080-funktionentheorie/images/gammapfad.pdf
 create mode 100644 buch/chapters/080-funktionentheorie/images/gammapfad.tex

(limited to 'buch/chapters/080-funktionentheorie/images')

diff --git a/buch/chapters/080-funktionentheorie/images/Makefile b/buch/chapters/080-funktionentheorie/images/Makefile
index 66e6d0f..1ddd585 100644
--- a/buch/chapters/080-funktionentheorie/images/Makefile
+++ b/buch/chapters/080-funktionentheorie/images/Makefile
@@ -4,7 +4,7 @@
 # (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
 #
 all:	nonanalytic.pdf integralanalytisch.pdf laurent.pdf \
-	fortsetzreziprok.pdf forts.pdf logforts.pdf
+	fortsetzreziprok.pdf forts.pdf logforts.pdf gammapfad.pdf
 
 nonanalytic.pdf:	nonanalytic.tex
 	pdflatex nonanalytic.tex
@@ -24,3 +24,6 @@ forts.pdf:	forts.tex
 logforts.pdf:	logforts.tex
 	pdflatex logforts.tex
 
+gammapfad.pdf:	gammapfad.tex
+	pdflatex gammapfad.tex
+
diff --git a/buch/chapters/080-funktionentheorie/images/gammapfad.pdf b/buch/chapters/080-funktionentheorie/images/gammapfad.pdf
new file mode 100644
index 0000000..13a6fc1
Binary files /dev/null and b/buch/chapters/080-funktionentheorie/images/gammapfad.pdf differ
diff --git a/buch/chapters/080-funktionentheorie/images/gammapfad.tex b/buch/chapters/080-funktionentheorie/images/gammapfad.tex
new file mode 100644
index 0000000..cf24c95
--- /dev/null
+++ b/buch/chapters/080-funktionentheorie/images/gammapfad.tex
@@ -0,0 +1,54 @@
+%
+% gammapfad.tex -- Pfad zum Beweis der Reflektionsformel der Gamma-Funktion
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{amsmath}
+\usepackage{times}
+\usepackage{txfonts}
+\usepackage{pgfplots}
+\usepackage{csvsimple}
+\usetikzlibrary{arrows,intersections,math}
+\begin{document}
+\def\skala{2}
+\definecolor{darkred}{rgb}{0.8,0,0}
+\begin{tikzpicture}[>=latex,thick,scale=\skala]
+
+\draw[->] (-2.55,0) -- (2.7,0) coordinate[label={$\operatorname{Re}z$}];
+\draw[->] (0,-2.55) -- (0,2.7,0) coordinate[label={right:$\operatorname{Im}z$}];
+
+\def\repsilon{0.3}
+\def\R{2.5}
+\def\d{0.04}
+
+\pgfmathparse{asin(\d/sqrt(\R*\R-\d*\d))}
+\xdef\A{\pgfmathresult}
+\pgfmathparse{asin(\d/sqrt(\repsilon*\repsilon-\d*\d))}
+\xdef\a{\pgfmathresult}
+
+\draw[->] (0,0) -- (70:\R);
+\node at (70:{0.7*\R}) [right] {$R$};
+\draw[->] (0,0) -- (-40:\repsilon);
+\node at (-40:\repsilon) [below right] {$\varepsilon$};
+
+\draw[color=darkred,line width=1.4pt] 
+	({\A-180}:\R) arc ({\A-180}:{180-\A}:\R)
+	--
+	({-sqrt(\R*\R-\d*\d)},\d)
+	--
+	%({-sqrt(\repsilon*\repsilon-\d*\d)},\d)
+	({180-\a}:\repsilon) arc ({180-\a}:{\a-180}:\repsilon)
+	--
+	({-sqrt(\R*\R-\d*\d)},-\d)
+	--
+	cycle;
+
+\fill[color=blue] (1,0) circle[radius=0.04];
+\node[color=blue] at (1,0) [above] {$1$};
+
+\node[color=darkred] at (120:\R) [above left] {$\gamma$};
+
+\end{tikzpicture}
+\end{document}
+
-- 
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