added space with hole

tikz/topology-sphere-with-hole/Makefile

@@ -0,0 +1,31 @@
+SOURCE = topology-sphere-with-hole
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg

tikz/topology-sphere-with-hole/Readme.md

@@ -0,0 +1,3 @@
+Compiled example
+----------------
+![Example](topology-sphere-with-hole.png)

tikz/topology-sphere-with-hole/topology-sphere-with-hole.tex

@@ -0,0 +1,20 @@
+\documentclass[varwidth=true, border=2pt]{standalone}
+\usepackage{tikz}
+\usepackage{tqft}
+
+\begin{document}
+    \begin{tikzpicture}[tqft/flow=east]
+        \draw (0,0) circle (2cm);
+        \draw (0,0) ellipse (2cm and 0.35cm);
+        \draw[white,fill=white] (0,0.1) ellipse (1.95cm and 0.35cm);
+        \draw[dashed] (0,0) ellipse (2cm and 0.35cm);
+
+        \begin{scope}[rotate=45]
+            \draw (0.5,1.2) ellipse (0.5cm and 0.4cm);
+        \end{scope}
+
+        \node at (2.38,0) {$\stackrel{\sim}{=}$};
+
+        \draw (3.8,0) circle (1cm);
+    \end{tikzpicture}
+\end{document}