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This prefix operator is used to represent n × m matrices. MAT has n arguments interpreted as rows of the matrix, each of which is a list of m expressions representing elements in that row. For example, the matrix

would be written as mat((a,b,c),(d,e,f)).

Note that the single column matrix

becomes mat((x),(y)). The inside parentheses are required to distinguish it from the single row matrix

that would be written as mat((x,y)).

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