pivot (or pivot element)
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1: 3.2 Linear Algebra
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►To avoid instability the rows are interchanged at each elimination step in such a way that the absolute value of the element that is used as a divisor, the pivot element, is not less than that of the other available elements in its column.
…This modification is called Gaussian elimination with partial pivoting.
►For more information on pivoting see Golub and Van Loan (1996, pp. 109–123).
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►Assume that can be factored as in (3.2.5), but without partial pivoting.
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