added tensor diagram

tikz/tensor-diagram/Makefile

@@ -0,0 +1,32 @@
+SOURCE = tensor-diagram
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux
+
+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:
+	make
+	#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/tensor-diagram/tensor-diagram.tex

@@ -0,0 +1,26 @@
+\documentclass[varwidth=true, border=2pt]{standalone}
+\usepackage{tikz}
+\usetikzlibrary{shapes, calc, shapes, arrows, decorations.markings} 
+\usepackage{amsmath,amssymb}
+
+\usepackage{xcolor}
+\definecolor{xvectorcolor}{HTML}{77933C}
+
+\begin{document}
+\begin{tikzpicture}[font=\boldmath]
+    \large
+
+    % Points
+    \node (A) at (0,2) {$X \times Y$};
+    \node (B) at (4,2) {$Z'$};
+    \node (C) at (2,0) {$Z$};
+
+    \draw[->, ultra thick] (2.1,0.7) arc(-70:260:0.4);
+
+    % Draw the triangle
+    \path[fill=blue!10, fill=blue!5]  (A) -- (B) -- (C) -- (A);
+    \draw[ultra thick, xvectorcolor, arrows={-latex}]  (A) -- (C) node[sloped,midway,below=-0.1cm] {$T$};
+    \draw[ultra thick, blue!80,      arrows={-latex}]  (C) -- (B) node[sloped,midway,below=-0.1cm] {$f$};
+    \draw[ultra thick, red!80, arrows={-latex},line cap=round]  (A) -- (B) node[sloped,midway,right=-0.3cm,above=-0.1cm] {$T'$};
+\end{tikzpicture}
+\end{document}