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https://en.wikipedia.org/wiki/Canonical_form#Linear_algebra Suppose we have some set S of objects, with an equivalence relation R. A canonical form is 阅读全文
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https://en.wikipedia.org/wiki/Underdetermined_system https://en.wikipedia.org/wiki/Constraint_counting In mathematics, constraint counting is counting 阅读全文
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https://en.wikipedia.org/wiki/LU_decomposition One way to find the LU decomposition of this simple matrix would be to simply solve the linear equation 阅读全文