While the determinant of the third order expansion by the elements of whatever row
we have, see [4], [5], [6], [8]:
From the description of two first columns of the determinants (first and second
columns) will be formed Scheme 1. respectively two rows ( first and second rows)
will be formed Scheme 2.The terms, which will be formed by the products of
diagonal elements in the left side in both of scheme 1 and 2 become the “-“sign. In
this way we get the Sarrus’ rule, which are valuable just to compute the determinants
of the third order. In base of the Sarrus’s rule we have:
While the determinant of the third order expansion by the elements of whatever rowwe have, see [4], [5], [6], [8]:From the description of two first columns of the determinants (first and secondcolumns) will be formed Scheme 1. respectively two rows ( first and second rows)will be formed Scheme 2.The terms, which will be formed by the products ofdiagonal elements in the left side in both of scheme 1 and 2 become the “-“sign. Inthis way we get the Sarrus’ rule, which are valuable just to compute the determinantsof the third order. In base of the Sarrus’s rule we have:
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