When performing elementary operations on $\lambda$ matrices, why can't we multiply a row or a column by a polynomial of $\lambda$ unlike in regular matrices? We can only multiply by a nonzero constant.
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What are $\lambda$-matrices? – TZakrevskiy Jun 07 '17 at 09:29
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A matrix whose elements are polynomials in the variable $\lambda$. – NDewolf Jun 07 '17 at 09:51