提交代码之前先看看能不能编译,还有以后要把代码放代码块
```
\documentclass{article}
\usepackage{amsmath}
\usepackage[showframe]{geometry}
\begin{document}
Thus $T$ must be an ordinal sum of the form sum of the form sum of the form $T \equiv \left(\left\langle {0,\frac{k_2 - k_1}{1 - k_1},T_1} \right\rangle,\left\langle \frac{k - k_1}{1 -k_1},1,T_2\right\rangle \right)$.
Thus $T$ must be an ordinal sum of the form sum of the form sum of the form $T \equiv \Bigl(\left\langle {0,\frac{k_2 - k_1}{1 - k_1},T_1} \right\rangle$,
$\left\langle \frac{k - k_1}{1 -k_1},1,T_2\right\rangle \Bigr)$.
\end{document}
```
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