Matrix element
A matrix element is a number or a mathematical expression that occupies a single position in a rectangular array of numbers and expressions that, in its entirety, is called a matrix. Often, a matrix element is denoted by a symbol that stands for the entire matrix, followed by the row and column numbers displayed as subscripts, for example Ai,j or just Aij for the element in the ith row and jth column of the matrix A.
Another usage is for a mathematical object which is called a matrix coefficient, unambiguously.
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