\documentclass[12pt,reqno,a4paper]{amsart}
\usepackage{extsizes}
\usepackage{blindtext}
\textheight 9.3in \textwidth 6.5in
\calclayout
\usepackage{amsmath,amsthm,amsfonts,amssymb}
\usepackage{hyperref}
\usepackage{mathrsfs}
\usepackage[all]{xy}
\usepackage[normalem]{ulem}
\usepackage{tikz-cd}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\begin{document}
\[\begin{tikzcd}
\underline{V}
\arrow[rrrrdd, bend left]
\arrow[rrdddd, bend right] \arrow[rrdd, dotted] & && & \\
& & & & \\
& & A \arrow[dd] \arrow[rr] & & B \arrow[dd] \\
& & & & \\
& & C \arrow[rr] & & D
\end{tikzcd}\]
\end{document}
above code is giving me following diagram
I used "phantom" technique to number part of commutative diagram. It did not work. I want to write
- (1) in the diagram enclosed by V,A,B
- (2) in the diagram enclosed by V,A,C
- (3) in the diagram enclosed by A,B,C,D
Can some one help me to see how to do this?