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Viewing Preamble for $(a,b)=(c,d)$ if and only if $a=c$ and $b=d$
[
back to '$(a,b)=(c,d)$ if and only if $a=c$ and $b=d$'
]
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{psfrag}
\usepackage{graphicx}
\usepackage{amsthm}
\usepackage{xypic}
