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### Function

LowerTriangularMatrix ( rng R, seq() Q ) -> elt-alg^mat

### Description

<shortdoc> The n by n lower-triangular matrix F over R, where #Q is n*(n+1)/2 and where the entries of Q, coerced into R, describe the lower triangular part of F, in row-major order. </shortdoc>

### Examples

LowerTriangularMatrix(Q,Sequence([1,2,3]));

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