LaTeX source

\documentclass{amsart}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
\begin{align*}
\underset{\text{\large(lower cap)}}{\xymatrix@=2em{
X' \ar[dddd] \ar[ddrr]_i^{[1]} & & & & Z \ar[llll] \\
& & d & & \\
& + & Y \ar[uurr]_v \ar[ddll]_j & + & \\
& & d & & \\
Z' \ar[rrrr]^{[1]} & & & & X \ar[uull]_u \ar[uuuu]_{v \circ u}
}}
&&
\underset{\text{\large(upper cap)}}{\xymatrix@=2em{
X' \ar[dddd]^{[1]} & & & & Z \ar[llll] \ar[ddll] \\
& & + & & \\
& d & Y' \ar[uull]^g \ar[ddrr]_{[1]} & d & \\
& & + & & \\
Z' \ar[uurr]^f \ar[rrrr] & & & & X \ar[uuuu]_{v \circ u}
}}
\end{align*}
\end{document}

摘要

描述Axiom TR4 (caps).svg	A depiction of axiom TR4 of a triangulated category. The figure in File:Axiom TR4 (polyhedron).svg is rendered two-dimensionally as its upper and lower halves
日期	2009年1月14號
來源	自己作品 (Original text: I created this work entirely by myself.)
作者	Ryan Reich
Other versions	File:Octahedral diagram variant.svg, File:Axiom TR4 (caps).svg
SVG genesis InfoField	The SVG code is valid.   This diagram was created with unknown tool.

協議

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.