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<blockquote>
<blockquote>
<math>
<math>
\hat{U}=(\hat{U}_{1}, \hat{U}_{2}),\hat{U}_{1}\in\mathcal{R}^{n\times r_{\epsilon}}, \hat{U}_{2}\in\mathcal{R}^{n\times n-r_{\epsilon}}
\hat{U}=(\hat{U}_{1}, \hat{U}_{2}),\hat{U}_{1}\in\mathcal{R}^{n\times r_{\epsilon}}, \hat{U}_{2}\in\mathcal{R}^{n\times (n-r_{\epsilon})}
</math>
</math>
</blockquote>
</blockquote>