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$ \begin{array}{l} {{A}{\mathrm{(}}{x}{\mathrm{,}}{y}{\mathrm{)}}{\stackrel{\mbox{\scriptsize ${T}\left({\begin{array}{c}{a}\\{b}\end{array}}\right)$}}\longrightarrow}{A}{\mathrm{'(}}{x}{\mathrm{ ',}}{y}{\mathrm{')}}\mathrm{{=}}{A}{\mathrm{'(}}{x}\mathrm{{+}}{a}{\mathrm{,}}\hspace{0.33em}{y}\ mathrm{{+}}{b}{\mathrm{)}}}\\ {\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33e m}\left({\begin{array}{c}{x\mathrm{'}}\\{y\mathrm{'}}\end{array}}\right)\mathrm{{=}}\left({\begin{ar ray}{c}{a}\\{b}\end{array}}\right)\mathrm{{+}}\left({\begin{array}{c}{x}\\{y}\end{array}}\right)} \end{array} $