更改

===薄SVD (Thin SVD)===

===薄SVD (Thin SVD)===

矩阵<math>\mathbf{M}</math>的薄SVD(又叫经济型SVD)可表示为:<ref>{{citation | last1=Demmel | first1=James | last2=Bai | first2=Zhaojun | last3=Dongarra | first3=Jack J. | last4=Ruhe | first4=Axel | last5=van der Vorst | first5=Henk A. | date=2000 |url=https://www.netlib.org/utk/people/JackDongarra/etemplates/node43.html| title="Decompositions" | url=https://www.cs.ucdavis.edu/~bai/ET/contents.html|book=Templates for the Solution of Algebraic Eigenvalue Problems | publisher=Society for Industrial and Applied Mathematics | doi=10.1137/1.9780898719581 | isbn=978-0-89871-471-5}}</ref>

矩阵<math>\mathbf{M}</math>的薄SVD(又叫经济型SVD)可表示为:<ref>{{citation | last1=Demmel | first1=James | | date=2000|url=https://www.netlib.org/utk/people/JackDongarra/etemplates/node43.html| title="Decompositions" |last1=Bai | first1=Zhaojun | last2=Dongarra | first2=Jack J. | last3=Ruhe | first3=Axel | last4=van der Vorst | first4=Henk A.|url=https://www.cs.ucdavis.edu/~bai/ET/contents.html|book=Templates for the Solution of Algebraic Eigenvalue Problems | publisher=Society for Industrial and Applied Mathematics | doi=10.1137/1.9780898719581 | isbn=978-0-89871-471-5}}</ref>

<math>\mathbf{M} = \mathbf{U}_k \mathbf{\Sigma}_k \mathbf{V}_k^*,</math>

<math>\mathbf{M} = \mathbf{U}_k \mathbf{\Sigma}_k \mathbf{V}_k^*,</math>