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- \documentclass{article}
- \usepackage{amsmath}
- \usepackage{amsfonts}
- \usepackage{amssymb}
- \usepackage[all]{xy}
- \usepackage[dvipdfmx]{graphicx}
- \def\x1xn{x_1, x_2, \dotsc, x_n}
- \begin{document}
- \[
- \xymatrix@M=8pt{
- R \ar@{^{(}->}[r] \ar@{^{(}->}[d] & R\lbrack\x1xn\rbrack \ar@{^{(}->}[r] \ar@{^{(}->}[d] \ar@{^{(}->}[rd]^\phi & R(\x1xn) \ar[d]^{\rotatebox{90}{$\sim$}}_{\psi}\\
- K \ar@{^{(}->}[r] & K\lbrack\x1xn\rbrack \ar@{^{(}->}[r] & K(\x1xn)\newline
- }
- \]
- \end{document}
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